So I just had sex with my boyfriend and we both lost our virginity on the 16th.. on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> I was projected to get my period today but I have no cramps, on another app I'm projected to get it tomorrow! Last time <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> was correct. I'm on the pill so I know it has to be at some point this week but is it possible that having sex a week ago can throw off my normal period day?!