Painful sex. No answers.

Patient: I am currently on the depo birth control shot and i think ever since i got my second shot of it that im getting side effects from it. Right after i got that second shot, it made me have some vaginal discomfort during sexual intercourse and when inserting a tampon. Theres no discharge or odor or itching. It just like burns and is painful when anything tries going inside. Is this from my birth control that im taking or is this from a vaginal bacteria infection?