Hello, my menustral cycle started on December 30th and ended on January 4th. My boyfriend and I had sex January 1st, 2nd, and 3rd and each night he ejaculated in me. I don't know if it's because I'm worried or just something in my head, but for the last week I have been very nauseated, I have random headaches, I tend to cramp sometimes during the day even though I'm not expecting my cycle, and I often find myself tired after a full day of going to class three days a week. Is there a chance that I could be pregnant or is it just because I'm worrying myself that I'm noticing all these symptoms?