I Have A Terrible Burning After Intercourse With My Husband

I have a terrible burning after intercourse with my husband and it is after ejaculation inside
I have been recently treated for vaginitis so I am sure it is not that
This is recent as before right after marriage we did not have these issues in the start
Medication shouldn't interfere but this did start after taking prenatals but I've also had this experience once before with a previous partner years ago
The burning is so bad near urethra but also inside vaginal lips and becomes very red and swollen
Help! I want to be able to enjoy us trying to make a tiny human