Hi and welcome to HCM.
How could you be taht sure without pregnancy
test. It can even few weeks after miscariagge be seen were you pregnant. Just do the test. Clindmycin oesnt have such reported side effects,but it is generally safe to take it during the pregnancy. Next time you must tell your doctors about your doubts. Also if bleeding persists you should do gyn work up. Wish you good health.