Since there was bright red bleeding with clots
, chances of miscarriage are high. You need to get blood HCG estimation 24 hours apart to see if the levels are falling. Also a scan may be scheduled to check if the baby is fine or there is a miscarriage. Bleeding can be due to simple causes such as cervicitis (infection/inflammation of cervix), vaginitis (infection/inflammation of vagina), or it can also be due to a part of uterine lining sloughing or due to threatened abortion.