my boyfriend and I have been sexually active for about 2 months.we had sex on February 16 and a week and a half later I got my period but the thing that was worrying me is that I missed my last period. *completely missed I don't just mean late*and I'm supposed to get my next one tomorrow *I've never been really regular and I've missed my periods before but it hasn't happened in a while.*we also had sex again on the 14 of this month*April*and he didn't use a condom but he didn't finish inside of me.how worried should I be?