Hello, so i had a pap test three days ago and sex is now painful, it's almost like burning pain. what could be the cause ?

A cut in the mucosa: it is either an angry cervix and the pain happening during deep penetration when the penis touched the irritated cervix or during the pelvic examination ,part of you mucosal lining in your vagina gut irritated, a simple cut unseen will create pain until is healed. eventually it should go away. if not see your GYN for proper evaluation and treatment

Dyspareunia: 19y had PAP exam recently followed by painful sex. Indeed, local cervical trauma might be explanatory. In women with benign Hypermobility Syndrome, possibly 7%, the dorsal lithotomy position undertaken for this exam can sublux the sacroiliac joint; arousing pain when same position is replicated during so-called missionary sexual position. Cuts heal & if dyspareunia persist then see Osteopath.