TMI! RH- momma's!

DH and I just had sexy time for the first time in about 6 months (long story) and when I went to clean up there was definitely a good amount of bright red blood. As if I were on my period. DH was also noticeably messy. My question is, I haven't gotten my rhogam shot yet for this pregnancy (will in 2 weeks, at my 30wk appointment), so I'm thinking I will probably need to get it after this bleeding. How long do I have to get it? I do plan on calling my doctor in the morning, but just wondering what you ladies think?