My boyfriend and I recently had unprotected sex round the time I was ovulating. I was PMSing around a week before my period was supposed to come, and experienced some cramping a few days it was supposed to start. It only came 2 days after it was supposed to, and then only lasted 2.5 days. It was a heavy flow for the most of it, and I had some clots too. I didn't experience other symptoms though. Could I be pregnant/could this have been implantation spotting?