Last week my boyfriend and I had sex using the pull-out method. My boyfriend swears that he did not ejaculate inside of me at all, but I was wondering what the possibility of becoming pregnant through pre-ejaculate is? I wouldn't be concerned except for the last two days I have had some slight cramping, tender and full breast and have felt sick to my stomach, as well as having a constant headache (not sure if this is anything). I used an ovulation calculator tonight and found that I most likely started ovulating on the day we had sex last week. I could be reading into this too much but thought i would reach out for advice. Am I being silly?