My last period was through August 29-Sept. 2nd. I had protected sex on September 7th .. We used a condom & it wasn't broken or leaking. And now I'm about 3-5 days late. Is there a chance I could be pregnant? I have been worrying about this for the past week. I do get symptoms as if my period is about to come (slight cramping, back aches, sore nipple (only one breast) but there's no flow and I'm starting to worry even more. Any advice?