Sorry people i meant 9 weeks.
If you're 9 months pregnant, you wouldn't just miscarry. You would go into labour, and deliver a full grown child. If you're that far along, it's possible sex just irritated your cervix and caused you to bleed, or it could be a sign you're about to have the baby. Are you having any form of contractions, or are you dilated at all?
You are pretty far along. Sounds like it is getting close to you giving birth, to me. I'd call your doc and just let them know. Are you having any contractions? Spotting after sex, can be very normal during pregnancy as it can irritate the cervix. Good luck!
brown blood is old blood i would just see your doctor just to rule everything out like infection and chek your curvix just to make sure all is ok.:-D best of luck and let us no how you got on lynne.