I'm not sure if I'm pregnant please help!

Breonna
I don't know what's going on right now! Wednesday morning my period started but me and my boyfriend had already made plans, so I drunk some lemon water to slow down the flow and it did, so we went along with the plans. At first we used a condom but we "took a break" for about an hour then when we started again, he told me he didn't have another. He's been telling me that he didn't spill any in me and I believe it bc he took it out a few seconds before he finished but my period hasn't cane back yet and my stomach feels funny in one particular area. We've had sex when I was in before and it always came back the day after but its been 3days! Am I over thinking it? I'll take any advice please help!