Problem upon problem

So I had sex for the first time on Saturday,

I am on the pill but I missed one for like 16 hours 2 days before but as soon as I remembered I took it.

We also used a condom but after he came he took it out and it was loose at the top with air?

Would there be a chance that I’m pregnant?

I’m also getting pains in my stomach like I’m about to start my period