Could I be pregnant? Late period, BFN

My period is 5 days late and I always have normal cycles. I've never been more than 2 days late. I've had sore boobs and nipples for about a week and a half (maybe 2 weeks). Took a hpt yesterday, BFN. Typically when I get my period, my boobs are only sore for a few days. Had two bouts of morning nausea (just queezy, no vomiting). I've read in some forums that some women didn't receive their BFP until they were 15 days late on their period! I just want to know, this waiting game is killing me!