He wanted to help a woman become Muslim, then they committed zina and she got pregnant, then she insisted on leaving him, and cut off ties with him
Question

                I would like to ask you a question which is killing myself -
I tried to help a women for reverting Islam though before she didnt had any religion and she agreed to marry with me but in the meantime we had sex without marriage and aftersometime she broke with me and Allah swt knows why she did that.

After that I repented a lot..May Allah forgive my sins and I tried to pray istekhara and during this period she gave the news that she is pregnant... which I told her that this is the sign for our marriage but she didnt believe it. Instead of that she got upset and angry as she became pregnant. Later she told me that she will abort the baby and we didnt marry.

Now its been 6 months she is carrying the baby and wants to deliever the child and In this meantime I have send several times of marriage proposal but she didnt accept.
I want my child back as well as her but she is not agreeing.

What shall I do to get my child back and and I know even we marry now the child will be illlegitmate.
There fore I would like to know what shall I do as I wana take the responsibility of the child and her and if its legal to do so... will i lose the child? If child born does he will have my name and am i legal to take care?

Kindly reply my answer at the earliest.
Praise be to Allah.
    We believe that everyone who reads this question must learn 
    from it and convey that lesson to people, so that they may protect 
    themselves and their societies from such errors, and understand how doing 
    things the wrong way must inevitably lead to wrong outcomes, even if the aim 
    was noble. The aim is not sufficient to make actions right; rather the 
    action must also be free of any element of evil or corruption, as Ibn 
    al-Jawzi (may Allah have mercy on him) said: We seek refuge with Allah from 
    starting any action without basin it on knowledge and reason.

    Talbees Iblees, p. 277 

    Similarly, we read what is mentioned in the question with a 
    great deal of sorrow. How the nafs (self) that is inclined towards evil 
    could take advantage of a girl who is interested in Islam, seeking guidance 
    and to learn about the Qur’an, and make her fall into the pit of desire and 
    forbidden pleasure, so that her search for guidance turned into an occasion 
    for resentment, anger and aversion, and showed her the darkness of sin 
    instead of the light of guidance. No light will be left in the heart of the 
    sinner; rather he will be stuck in the mire of his sin, and what has tainted 
    his heart of evil can hardly be washed away except after sincere repentance, 
    a great deal of praying for forgiveness, and turning to Allah, may He be 
    exalted, with humility and humbling oneself before Him, in the hope that He 
    may pardon and forgive, and help him to come back to obedience to his Lord, 
    so that he may move beyond this dark stage in which the sin began by forming 
    a relationship with a non-mahram woman and ended with zina.

    See also fatwa no. 
    11195 

    Now that you have knocked at the door of repentance and have 
    turned to Allah, may He be exalted, you must understand some shar‘i rulings 
    which are very important in your case; we will list them for you below: 

    Firstly: 

    It is not permissible for a Muslim to marry a woman of any 
    other religion apart from the people of the Book, namely Jews and Christians 
    and those whom the scholars included under the same heading. As for a woman 
    who does not follow any religion at all, not even in name only or on 
    official papers, it is not permissible to marry her. Allah, may He be 
    glorified and exalted, says (interpretation of the meaning):

    “And do not marry 
    Al-Mushrikat (idolatresses, etc.) till they believe (worship Allah Alone). 
    And indeed a slave woman who believes is better than a (free) Mushrikah 
    (idolatress, etc.), even though she pleases you”

    [al-Baqarah 2:221] .

    No exception is mentioned except in the case of the people of 
    the Book, because of the general meanings of the word mushrikaat (fem. pl. 
    of the word  mushrik, meaning one who associate others with Allah). 

    Ibn Qudaamah (may Allah have mercy on him) said: 

    With regard to all disbelievers apart from the people of the 
    Book, such as those who worship whatever they see fit of idols, rocks, trees 
    and animals, there is no difference of scholarly opinion that it is haraam 
    to marry their women or eat meat slaughtered by them.

    End quote from al-Mughni, 7/131 

    This has been discussed previously in fatwa no.
    2851 

    Secondly: 

    Attributing the child who is born as a result of zina (with a 
    woman who is not married) to the zaani is also a problematic matter. The 
    Prophet (blessings and peace of Allah be upon him) said: “If (the child) is 
    from a free woman with whom he cohabited, he is not to be attributed (to the 
    zaani) and cannot inherit from him.” Narrated by Abu Dawood in as-Sunan, 
    2265; classed as hasan by al-Albaani in Saheeh Abi Dawood. 

    We have previously discussed this issue in more detail in 
    fatwa no. 33591 and
    175523. 

    Thirdly: 

    With regard to m of the child, there is nothing wrong with 
    you spending on the child who was born as a result of zina if you want to do 
    so, provided that this is done from a distance, by sending the money through 
    a bank account for example, without being in contact with that woman or 
    meeting her, so that the sin will not be repeated and so that the Shaytaan 
    will not cause temptation between you. 

    Fourthly: 

    It is not permissible for you to carry on trying to convince 
    her to marry. She has been put off and has been faced with distress because 
    of that sin. Similarly, it is not permissible to use the fact that you 
    prayed istikhaarah and that she became pregnant as proof that this marriage 
    is something good. We think that this is a kind of getting carried away in 
    temptation and is an attempt to confuse that woman. The marriage that is 
    prescribed by Allah, may He be exalted, and is liked by Him is not something 
    for which pregnancy that results from haraam actions can be interpreted as a 
    sign in its favour; rather it begins with obedience to Allah, may He be 
    glorified, and adherence to His laws and commands. 

    Our advice to you is to stop attempting to convince her; 
    rather you must stop trying to communicate with her in any way, because 
    there is no way that you can marry her if it becomes clear that she is 
    neither a Jew nor a Christian. Even if it becomes clear that she is a 
    follower of one of these two religions, there is no way that you can marry 
    her because she has refused and is convinced that marriage would fail after 
    it has been spoiled by zina. 

    We ask Allah to forgive us and you, and to grant us all well 
    being. 

    And Allah knows best.