Help!!!!

I had sex with a condom for the first time. It didn't last very long, but later that same day we did it again, and that also didn't last long. The next morning, my boyfriend had a condom on but didn't cum. Two days ago, I got a bladder infection, and now I'm really nauseous and have lower back pain. These are symptoms of pregnancy. I'm due to get my period in about 14 days, and this happened last week. What do you guys think?

I can't buy a pregnancy test right now. I'm panicking; I've never had lower back pain before, and I also have stabbing pains on both sides.

I mean, with the condom, it didn't last long, plus he didn't cum, so it's impossible, right?