What do you recommend? Am I being paranoid?

I had my period this month, but the month before it was late by 2 weeks. So I don't know if out was because it was late that it interfered with my cycle. Anyways 1 week after my period this month I was spotting. Today 2 weeks later I have felt nauseated. My husband and I did have intercourse during my ovulation last month. I took a pregnancy test but it came negative and it was a cheap kind where I had too pee in a cup and get a dropper to put on the test. I was nervous an stupidly didn't there was water in the cup. Is it possible that I'm pregnant?