Could I be pregnant

Im 18 and I slept with my boyfriend about 3 weeks ago. We used a condom (it didn’t break) and he pulled out far before he came. It was only my second time ever and I had some light bleeding for the next couple days afterwards.

I was supposed to start my period two days ago but nothing has happened. I’ve just had cramping for the past couple days and clear discharge. I read that stress can cause your period to be delayed, and I’m obviously super stressed about getting pregnant.

I know the chances are slim because we were safe, but I’m really worried and I want to know some of your opinions.

Thanks:)