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Could I be pregnantc

I’m on the pill, and me and my boyfriend of 5 years started having unprotected sex. I’ve had two heavy periods since the last time I’ve had sex, ive been on this diet where I drink no alcohol but I recently had some drinks w my family, I had a v upset tummy causing me to bloat and for me to feel nausea. Could I possibly be pregnant? Or the fact I hadn’t drank alcohol for two months then I had a few drinks causing my tummy upset. Really need some advice