OK, so heres my question, I hope you can help:

I had unprotected sex on the last day of my period last month. about 8 days later I started bleeding again, but this time only lightly for 4 days instead of the 8 for my cycle. I have not been drinking alcohol, yet wake up as if I have a tremendous hangover. And wake up in the early AM feeling very nauseus. Have been craving things I normally wouldnt. I was due for my period today but have not gotten it yet. I took a pg test, but it was negative, but I feel like I am. My neck has been aching for a week or so, and I have broken out all over, I also have pains on either side of my abdoman, and cramping (which i usually do not have until the 2nd day of my period. Also, I never get yeast infections, and I have had 2 since last month. Does this sound like I could be preggers? Please help~!