Can I Fast If I Am Spotting After Period?
Question

I fasted four days in Ramadan, then my period came. After my period ended, I purified myself (did ghusl) and started fasting, but some drops of blood came out (“spotting”), then they stopped. Then when I purified myself and started fasting again, the spotting started again, and this lasted for the rest of the month of Ramadan. What is the answer concerning this?
Praise be to Allah.If the situation is as you describe, the drops of blood that appear after becoming pure from menses are not regarded as menses , because it is not ongoing bleeding. So it does not come under the ruling of menstruation, and you have to fast and pray , and do wudu for each prayer when the time for the prayer begins. The same applies to women who suffer istihadah (non-menstrual vaginal bleeding) and those affected by ongoing urinary incontinence . And your fasting during those days is valid.” (Fatawa Al-Lajnah Al-Daimah, 9/83,  Shaykh ‘Abd al-‘Aziz ibn ‘Abd-Allah ibn Baz, Shaykh ‘Abd al-‘Aziz Al al-Shaykh, Shaykh Salih al-Fawzan, Shaykh Bakr Abu Zayd) 
For more about menses and fasting, please see these answers: 50282 , 93793 , 191684 , 38932 , 50330 and 66062 .
And Allah knows best.