If a woman miscarried in a river she is a תשב לזכר ולנקבה ולנדה.
True.
False.
If she is not known to be pregnant.
מחלוקת A&B.
מחלוקת A&C.
A pregnant woman left, and returned not pregnant much later. The first three weeks after returning, she did not see blood. The following ten weeks, she alternated. She would see blood for seven straight days, and then have seven clean days, and repeat this. Bi'ah is forbidden on day 21.