I have these spots and not sure what they are

i have been with my partner for 4 months and have been sexually active regularly.
a few days after we had sex, i felt pain in my groin while trying to pee. had a look and saw white discharge.
doctor diagnosed with vaginal thrush and prescribed cream.
the discharge has gone and now spots have appeared. they dont hurt, dont itch or cause irritation but am afraid it may be an STI