Second Trimester Sex

Hi Mummies, Just wanted to find out more on what’s normal and what’s a red flag that I’ve to consult my gynae- after sex there’s vaginal pain and kinda burns when peeing. Not sure if it’s due to the changes in hormones or cuz there’s an infection(?) but also been feeling quite swollen below during this period but no peeing issue till after sex. Thanks for answering in advance! #advicepls