I’m wondering...

I don’t know if I’m pregnant or not.. my last period was very weird to me. I normally go 5-7 days, I only went maybe 2 1/2 days & it was very light & it was a couple days before I should of started. And lately, like a week or so my stomach just feels off, like... I don’t know how to explain it... it’s sorta like the upper stomach is kinda tight, and the lower just hurts a tiny bit but not too much. Also my side hurts every now and again. Has anyone went through this in any of your pregnancies? Or is it something else? I’ve done home pregnancy tests but I’m not sure if it’s giving me a false negative or I’m actually not pregnant and I’m just going crazy (lol). I’m kinda hoping I am pregnant.