19 days late & 3 negative hpt!?

As of today I am 19 days late for my period. My last period was 3/28/09-4/3/09. I usually have a 30-34 day cycle and any way you look at it I'm extremely late...I have taken 3 hpt and each of them has come back negative. I have a lot of symptoms but am wondering if I am making them come on or are they really there? I have the sore ( and they seem to be bigger), mood swings, nausea, heightened smell ( Everything seems to be a lot stronger), sensitive , weird cravings (really weird, I weird myself out by what sounds good), I am exhausted ALL the time, but have a hard time sleeping through the night. My period is usually pretty regular and this is way out of the norm for me. My FH and I aren't trying but we aren't being careful either. He recently stopped using condoms and pulling out. I'm sorry if this is TMI but I don't know what to do. I know if you stress over it you are more likely to delay your period, I'm not stressed right now but my Grandpa ped away a few weeks before my last period started. Could that be what is delaying it. The situation makes me sad but I'm not stressed about it. I would really appreciate your opinions! I don't know what to do!