I had unprotected sex with my boyfriend on the 16th, 17th, and 18th of this month while I was ovulating. And again on the 22nd after I stopped ovulating. I have had lower back pain and very mild lower abdomen cramping. My period doesn’t start for another week. Could that be signs of implantation but too early to test? Experienced mommas help me out. This would be my first so I don’t know what to watch for. I just know my period cramps never started until the day I was on my period....