Hi , Yesterday I Had Sex For The First Time

Hi , yesterday I had sex for the first time but we only did it for 3 minutes ... It was the guys first time too he didn't cum he just had pre cum on the tip of he penis that's all but the thing is that it's been around 2 months that we started messing around with each other I would grab his parts and he would grab mine and I just wanted to know if I should be worried about being pregnant ?