Hello, You did protected sex and got period after 2 months. You can undergo one home pregnancy test to clear confusion about pregnancy. There are several reasons of ate period like PCOD, hormonal imbalance, over weight/ extreme loss, mental stress, emotional upset, eating disorder, thyroid problem etc. Therefore, I suggest to undergo one USG lower abdomen and hormone test in the absence of pregnancy. Kindly, consult with your gynecologist and take advice accordingly. Combined hormonal pill is quite effective to treat irregular late period. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well and practice safe sex in future.