Bleeding after sex

I'm in my early 30's and after taking the pill for 8 years I recently got off birth control 6 months ago.
​I'm not trying to conceive but I want to have a more natural birth control method. My husband is totally supportive. I've noticed my cycles have been averaging 33 days and getting longer the last month.  The last two times we've had sex I've gotten pelvic cramps during and then bleeding after.
​I'm going to see my doctor this week but has this happened to anyone else? I'm concerned... Thank you