Need suggestions

My bf and I have been trying to have a child.. We had sex on one of the most fertile days while ovulating 2 weeks ago. Lately I've been throwing up, have no appetite, feel dizzy, cramping, and sore nipples. We took a test 2 days ago and it came out negative... I'm supposed to start my period today but nothing yet... What are the possibilities that I could be pregnant? ... I don't want to get excited but I just need suggestions ??,,,