Does anyone else get cramps after period?

I just finished my period 3 days ago, it lasted 4 days but I’m still getting slight cramps in my pelvic/lower abdominal area. And tmi, I’ve also been pooping a lot and I have this greenish white discharge and itching down there. Don’t know what all of this means, but’s it’s kind of odd. Does anyone else experience cramps after their period is over? I am sexually active, as well as on birth control. Boyfriend came inside me a little bit on my expected period day and I got it 5 minutes later? Is it possible I could be pregnant even though that happened?