My first time

So yesterday I 'did it' for the first time with a guy that I've been dating for two and a half years and I do love him. I'm 18 and he's almost 18. This was both our first times and he used a condom but now I'm paranoid about getting pregnant. I'm almost 100% sure that the condom didn't break and nothing spilled but I'm still really anxious because it was my first time! No one knows that we did it. I've been looking stuff up on the internet all morning but does anyone have any tips or advice? Thanks