I had unprotected sex 9 days ago on May 21st and I have received what I thought was my period today on May 30th. Could I be pregnant? I am also 15 years old, it was my first time, and it only lasted for like 2 minutes. I have been feeling crampy lately. I have read about implataion bleeding, but is it just my period?

You can get pregnant anytime you have sex, it doesn't matter how long it lasts for or how many types of contraception you use. If you're not ready to become a parent then I strongly suggest you stop having sex.

Implantation bleeding is rarely noticed, it can be only the size of a pin head. You will need to take a test and see how your period is next month, if its light or spotting, test again.