The pregnant woman is not prevented from praying and entering the mosque
Question

                I have a question about religious prohibitions for a woman when she is pregnant, specifically prayer and entering the mosque. The person who is asking is a non-Muslim woman, and she wants to do research on the Islamic rulings on women entering the mosque.
Praise be to Allah.
	Firstly: 

	Islamic teaching does not allow a woman to pray or enter the 
	mosque when she is menstruating, as has been explained previously in fatwas 
	no. 33649 and 146758. 

	With regard to a woman who is pregnant, Islamic teaching does 
	not forbid her to pray or enter the mosque. So she is obliged to offer the 
	five daily prayers, and she may offer whatever supererogatory prayers she 
	wants. It is permissible for her to enter the mosque to pray or to attend 
	lessons and lectures and beneficial gatherings, so long as she adheres to 
	the conditions set out in Islamic teaching for a Muslim woman to go out to 
	the mosque, which have been explained previously in fatwa no.
	49898. 

	Secondly: 

	There are Islamic rulings which Allah, may He be exalted, has 
	prescribed for the pregnant woman, that are appropriate to her situation. We 
	will mention some of these rulings here. They include the following: 

	It is prohibited for her to eat or drink anything or to do 
	anything that will harm the foetus or lead to miscarriage. For more 
	information, please see fatwas no. 13319 and
	146158. 

	It is permissible for a pregnant woman to break the fast in 
	Ramadan if fasting is too difficult for her. The ruling may reach the degree 
	of it being prohibited for her to fast if doing so will harm the foetus. 

	It says in al-Mawsoo‘ah al-Fiqhiyyah (16/271): 

	It is permissible for the pregnant woman to break the fast if 
	she fears or thinks it most likely that she or her child will be harmed, and 
	she must break the fast if she fears that she may die or be greatly harmed, 
	and she has to make up the fasts, without paying any fidyah (penalty). This 
	is according to the consensus of the fuqaha’ (jurists). They are also 
	unanimously agreed that a pregnant woman does not have to pay the fidyah if 
	she breaks the fast for fear of harm to herself, because she is in the same 
	situation as a sick person who fears harm to himself. End quote. 

	And Allah knows best.