Okay so had unprotected intercourse on August 22, 6 days later I got a period and it only lasted 4 days (which is weird for me it's usually up to 7 days) anyways it's now December and I haven't had a period since then. Like once every other two weeks, when I wipe I have like a drop of blood and when I re-wipe, there's nothing. I've been having pregnancy symptoms, that come and go and I've been cramping and sometimes I have small stabbing pain in my lower abdomen, but I just haven't been able to take a test. I have irregular periods so i didn't know when i was exactly ovulating, since i usually start my period around the 11th so can someone please help me answer? Or if someone had something similar to this, can you tell me why it happened?