So on Oct 9th or 10th I had unprotected sex with my boyfriend. We are both 20. Im having trouble figuring out if I m pregnant or not. I don t have a regular period because active anorexia ( I m doing my best to overcome this) so occasionally my periods will come a bit later than usual. As of October 8th I was 100% sure I wasn t pregnant. It s now the 25th and I m not sure if this is implantation bleeding or regular period. My periods generally last 3days. 1st day is spotting and gets heavy by night time, 2nd day heavy and a bit of clotting, 3rd day is clotting and usually ends by the morning. So today I woke up and felt like I was going to have my period and noticed some spotting. It s 1:35pm and it s gotten heavier. Now, I ve read a lot about implantation bleeding and pregnancy. Whats the quantity for implantation bleeding? After the spotting i put on a panty liner and soon had to change to regular pad. Does that mean this is my period. What confuses me is I ve also had some ligament pains in pelvic area earlier in the month...which is said to be a sign of pregnancy. But I think I ve had them before? I don t know. Any advice will help!!