So my ex boyfriend and I had sex and a week later I was feeling very nauseous and kept wanting to throw up. there was a day where I was feeling very sick and didn't eat then wanted to throw up but nothing came up because my stomach was empty. the following week I had my period very light and it lasted a week. this week I've been getting cramps on the lower part of my stomach. could I be pregnant? I've taken a test but I feel like i messed it up.