Worried

Recently my boyfriend and I started to have unprotected sex (judge me if you must, I don't care) and he hasn't gone inside of me that were aware of. I haven't had my period yet, and I'm late a week. I've taken some pregnancy tests and they were negative. That was a few days ago and my period still hasn't come. A few days ago I had light peachy/pink very minimal when I wiped and then it went away. I have had a little light cramping by the bottom of my tummy. I was wondering if anyone had any thoughts.