Okay, so I was supposed to get my period on the 28th of July but I still haven't gotten it. My boyfriend and I had sex, unprotected, multiple times 5-7 days before my ovulation should have taken place if it is on track. Can sperm survive that long? I had some really watery brown discharge for about 3 days starting the day I was supposed to get my period but I haven't noticed it since. I have also been really tired lately. Could I be pregnant?