Sounds like a yeast infection. It usually burns after sex. If its not, u may just be more sensitive to ur partners sperm now that ur pregnant.
I Have Experienced The Same And My Doctor Told Me It's Because The Wall Of Your Vagina Might Be Thinner Then Normal Due To The Pregnancy , So When Pushed Upon It Irritates The Skin , And Causes To Burn Or Be Irritated After Intercourse.
No ..he might have gave you an infection