I'm a little worried that I might be pregnant. Logically I don't think I am, but I can't help feeling like I might be. The last time I had sex was three weeks ago. I got my period last week, but it was really light and the last few days were just spotting. I've been feeling naeseous all week and it's worse after I eat. I've also been having lower back pain and I've been more tired than usual and a couple days this week I've had a low fever. I thought it might be a stomach bug but it doesn't feel like it is. Is it possible I'm pregnant? Should I take a test now or wait to see if I miss my next period?