I missed my last two active pills in my pack and then got my period a few days later. My period ended on March 21st and I had unprotected sex with my boyfriend the 21st, the 22nd, and the 23rd. I haven't missed any pills since the last two pills before my period, but my lower back is sore and I don't know if I'm just paranoid or if I could actually be pregnant.I know this is super early in my cycle to get pregnant but is there a chance? I'm so scared I'm only 19.