please help me

So I'm on the pill, it's my first pack and I'm three weeks in. I can't eat anything without feeling extremely bloated and tired afterward. Is that normal? Idk what to do. I'm worried that I'm pregnant but they tested me before putting me on the pill at the doctor and my only pregnancy risk was protected sex with a condom, he didn't ejaculate. And that was two months ago, I've had two periods since then. One was lighter than they usually are but there was still a flow and red blood