Is it even possible for me to be pregnant!?

It is absolutely possible to become pregnant. Any time you are ually active to any degree with a boy, you could end up pregnant. Protection, birth control, withdrawal, and everything you talked about are never guaranteed. There have been some cases where individuals have become pregnant through their clothing, without even taking it off. The good news, for you, is that cases like that are extremely rare and odds are you aren't pregnant. Stress however can be very harmful for your health, and I'd recommend sharing everything you shared on here with your doctor. He'll be able to get more information and will be able to have a better idea of what's going on and how you can help it down the road.