I'm 17 year old female. I had unprotected sex on January 19th. He finished in me about 3 times that day. I was suppose to get my period January 29th but didn't get it until the evening of the 30th. I had no cramps which worried me as I usually have such bad cramps I cry. My period was a lot lighter then usual and it also only lasted about 2-2 1/2 days. Is there a chance I could be pregnant ?