Confused!?

B
I had sex on all the days of my ovulation with my boyfriend and my period came 3 days late and was spotty and light for 2 days then after that i had bad cramping and no blood or anything i took a test before and it said neg i think it was to early its been a couple of weeks now and i go to a doc appt in 2 days but i wanted to know if anyine else felt like this i get nauseas in the morning but never throw up i feel like it but dont iv been having slight cravings and freguent peeing my nipples are slightly sensitive to the touch and i have a bloated tight feeling in my uterus area almost like i have to fart but can anyone else ever have anything like this?