Possibility?

Hey ladies, so aunt flow isn’t due for another week, but the last three days I’ve been having horrific backaches, cramping in my lower abdominal and pelvic cramps, I’m being sick or feeling nauseous with everything I smell or eat and feeling like a butterfly feeling in my belly. I know it’s obviously to soon to take a test but could this possibly be a sign of pregnancy if I was pregnant it would work out I’d be 3 weeks. did anyone else have anything like this and get there BFP?

Just want some support and advice