On April 26th I had unprotected sex while ovulating. It was a one night stand, but he did release inside of me. I am not trying to freak myself out, but I can’t help it! Is it too early to have signs of implantation? I never get period cramps and have had decent cramps on my left side about everyday since and my lower back is killing me. I’m not suppose to start my period for a week. Also, I have had diarrhea every day since. So, do you think it’s possible? Thanks in advance!