Can I be pregnant ?

My boyfriend & I have been having sex somewhat frequently, but a few weeks ago we were having sex (w/ a condom) & he finished in the condom & he pulled out, but we switched positions and he went in with the same condom 😔( Ik Ik stupid asf ) & then he pulled out again and when we were switching positions I Noticed that all of his cum was gone, But I didn't really care and kept going 😕. Now I feel like his cum leaked inside me & I'm scared that I might be pregnant. This happened two weeks ago. Do you think that there's a chance that I might be pregnant ?

Ps. I'm 15 & my man just turned 18 a few months ago & was throwing up today. My period is due in about a week. I had sex during my fertile window, but I didn't realize until hours later.