I got early stage miscarriage (6weeks) without fetus. So far it's happened more than 20 days. I am still got spotting blood daily. I would like to know am I allowed to do fasting & prayers? If the answer is yes, may in know what's the different between menstrual bleeding and miscarriage bleeding? And why during menstruation is not able to fasting but miscarriage is no problems. Thank you for your time.
In https://www.dar-alifta.org/foreign/ViewFatwa.aspx?ID=8084 your desease is enumerated among the reasons that allow you not to to fast. The general prescription is al-Baqara 2:183-85
So whoever sights the month, let him fast it; and whoever is ill or on a journey - then an equal number of other days. Allah intends for you ease and does not intend for you hardship and for you to complete the period and to glorify Allah for that which He has guided you; and perhaps you will be grateful.
See also https://www.dar-alifta.org/foreign/ViewFatwa.aspx?ID=8083, also in case you decide to fast (in this case, ask a doctor).