This may be a bit TMI so I apologise, but has anyone abruptly started bleeding halfway through intercourse, even though you're not due on your period and are on the pill? I had this and then afterwards it felt, and the only way I can describe it was as if my abdomen was filling with blood or something similar. I know it wasn't bloating or anything like that as I know what that feels like, and this was weird. I didn't bleed for long but the odd feeling in my stomach continued for about 24 hours. Has anyone had this and do I have reason to be concerned? What should I do if it happens again?