Need help before I go crazy!

I was messing around with my boyfriend and we came close to sex. It was 2 days after my period ended. Which was July 6th. He went in a couple times and he said he's pretty sure there was precum. I've been googling like crazy and everywhere I go I hear the word pregnant. I've been feeling sick lately  which I'm sure doesn't have to do with anything. But can someone tell me it's all in my head?