ENLARGED UTERUS

so I went to Dr today for a papsmear , and trying get to the bottom of no period since December, I'm not pregnant, hormones level seem good, however up exam he said my uterus looked enlarged. So I'm sorta tripping , but he also said my blood last month said std. I'm not promiscuous so I'm concerned, idk what's going on..

do you get painful periods? enlarged uterus makes me think of adenomyosis, which I have and it’s where the lining of the uterus grows into the myometrium which can cause it to be enlarged. I get a lot of pain down my legs, in my hips, pelvis, and back. it can also cause heavy bleeding, clots, and false labor/contractions. did the doctor mention a type of STD? could also be untreated PID