I'm 18 and normally on the pill. I had unprotected sex with my boyfriend of 2 and half years at the end of my period and forgot that I hadn't taken the pill. I then went and took the morning after pill an hour and half after having sex. After that I then took the contraceptive pill for 3 weeks afterwards until my period was due. I wasnt late but it only lasted 3 days instead of the usual 5 days. It was exactly the same as it normally is, same heaviness and same colour. I hve started taking the pill again but have really bad stomach cramps every now and then. Please can someone help me or has anyone experienced anything like this? I sometimes have lower back pain, but I think that is from a fall I have recently had. Could I be pregnant? Please help!!