Period Probs TMI

Hey ladies. This may be TMI for some, & I apologize, but I'm just a little worried...
Sooo I am four months postpartum & I've been getting my period regularly the past couple months, just like normal. I've always had regular periods, right on time. No weird stuff. This month, I got it on Thursday the 8th & it ended Tuesday the 13th. 
TMI..
Thursday I had sex with my husband. We used a condom and I had to have him take it off during it because it was hurting me. After we were done, he told me I was bleeding. It wasn't much & I figured it was just from the condom rubbing, that's why I had pain. I wondered if it could've been my period still, even though it had been over for a couple days, but the blood was bright red. Friday everything was fine. No blood. All good. Now this morning, I woke up to what looks to be the start of a period.
I'm wondering if it's something I should be worried about. Have any of you who had normal periods before, had something like this happen postpartum? Don't know if I should just ride it out or go to the doctor.