Hi Welcome to the health care magic and thanks your query here some times low hormones levels specially progesterone levels can cause uterine linings to start shedding and even miscarriage but a blood loss doesn’t always mean you could be experiencing a miscarriage Bleeding during pregnancy, especially during the first trimester, is more common than you might think. But it should not last more than 3 days And should always be reported to your gynecologist Keep a watch on your bleeding along with other symptoms like abdominal cramps And take medications prescribed by ur dr and do complete rest until everything become normal again I hope it helps Thanks again for the question