Pregnancy Scare

Hi I’m 22 and my fiancé and I had a little bit of unprotected sex Nov. 5th he didn’t come at all. I took a test and it was negative my period starts in three well basically two days now and I’m cramping and I have sore breast. But I’ve been throwing up stomach acid??? I feel it’s from anxiety and stress I would just like some answers to clear the air for me❤️