My last period was January 11, 2012. The last time me and dh had sex was January 25,26,28 2012. I was supposed I get AF febraury 7,2012. My nurse me to wait It out til the weekend and if she doesn't show take a hpt.
Being on and coming off birth control, especially the pill can make this happen. It can make your cycles out of whack and cause you to have pretty horrible PMS symptoms. Sometimes it can make you feel that ay and you don't see AF till a couple weeks later. It's just your body adjusting.
The signs of early pregnancy are just the same as the signs of your period about to begin as well as other things - so that's not reliable. When was your last period and when did you last have sex?
I would suggest waiting another week and if you still feel like this and AF hasn't showed then you should take a HPT with first morning urine.