Hello. I had sex with my penis on 15 april to 17 april without using protection but I didn't discharge my sperm into her vagina and her periods date about 25 april to 28 april but still its upto 10 days more now but the periods didn't come. They use tablet primolut n for periods after take this tablet they got some pain in stomach for 24 hours but still didn't get periods. What is this? Is this any chance of such disease or any anything else? And the basic info I mention below its about my penis.