pregnant?

About 3 weeks ago I slept with this guy and he didn’t wear a condom- I’m on the pill currently, but a few days later I missed two pills from my pack. My period is due tomorrow & I’m having terrible cramps, I’m breaking out (more than usual), very emotional, feeling full when I barely eat anything. I have light spotting it’s a very light pink color and sometimes it’s brown. I’ve tried eating foods I like but I always feel full and I’m very gassy also. I took 3 pregnancy tests and they have all said negative?