Pregnant after period?

My period ended 6 days ago & had sex on the last day of my period. Then again 2 days after, 3 days after and also on the 4th day after period ended. By day 5 I was getting brownish/pinkish spotting occasionally when I would go pee. Here we are day 6 after and I’m getting the same thing. I also am having lower abdominal cramping below belly button but on both sides & sometimes I get crampy feeling in my lower back as well. I’ve also noticed weird twinges in my vagina the last few days. Is it possible to get pregnant coming off of your period? Could this be early ovulation? Any advice on what could be the issue? I feel like I’m way too early in my cycle for these symptoms.