So my period was march 24-28. My husband and i had sex march 30th. My cycle is normally 23-24 days. My period calculater estimates my fertile cycle starts literally the day after my period. Anyways here the past 2 days ive been really nauseous(to the point ive been holding myself back from throwing up), back aches, groin pain, gassy(constipated,tmi sorry), and somewhat sore boobs. If i didnt have the flu early last week i would think it was that but i had it for 2 days then fine. My period is suppose to start the 18th, would it be to early for pregnancy symptoms?