Bleeding after intercourse

My husband and I have not had much sex.since I found out I was pregnant. It makes me nervous and I'm never in the mood. But we had sex last night and afterwards I bled. It wasn't deep dark red it wasn't a whole not but I did bleed. I know I've read about it on here before but can't seem to find any posts. Has this happened to anyone and is it okay? This was my whole fear with having sex and I just don't want anything to happen to the baby.