Could I be pregnant?

I haven't take a test and it was my first time so I'm new in this, we used a condom but once we noticed the condom falled out, we stopped. That didn't last even a second but I'm wondering if I could be, I took an after day pill, and I just had my period. I notice my belly a little bit but I suppose it must be because of holiday's (I ate a lot).

Most of it was mere make out (clothes on) and almost no penetration, I just turned 18

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