Can you ovulate when your pregnant!?

So I had sex earlier in the month and I had breakthrough bleeding while I was on my pill I took the pill before I had sex and I'm just here confused. I've been doing Dry pregnancy test I did the salt test it told me that I wasn't pregnant. But I'm going to the store with my. Friend tomorrow to see if I'm pregnant which I hope I'm not. But lately I've been feeling abdominal pain. And I've been thinking I'm ovulating I see white discharge. Someone please help!?