Girls, hello! I've been having stomach pain for the past 3-4 days. And…

Girls, hello! I've been having stomach pain for the past 3-4 days. And decided to check if it's pregnancy because my period is due in 3 days (25th). Do you think this could be pregnancy? I'm on count 4, but I'm still worried, even forgot how to act properly... Is an ultrasound needed after 6 weeks? Also, I wanted to ask, today in the morning my throat hurts and I feel weak. I can't drink anything, I just gargle with salt water. Usually, I take paracetamol in such cases, but I don't want to risk it now, what if the baby really comes ?