My last period began on the 17th of March and on Friday the 6th of April I had unprotected sex but it was only for literally about 5 seconds before he pulled out so are the chances high that I am pregant? He did not ejaculate. My next period due this weekend and my tummy has been sore for the past 2 days and I am scared this could be signs of implantation although I might also just be paranoid. Someone help :)