Post sex

So I had a baby 5 months ago and we’ve had sec since then and everything felt fine but recently every time we have sec my vagina burns and I always pee afterwards and today I peed after and it like burned really bad not coming out of the urethra but when the urine trickled down onto the labia so I was wondering if anyone has ever experienced this and if so what was the outcome? I’m going to schedule an appt with my OB cause it’s obviously painful and annoying and I’m having a lot of feelins of urgency to pee all the time and it’s affecting my daily life but I just wanted some ideas or something from other women who may have went through this cause I feel gross and like imthe only female who goes through this