Someone please ease my mind!

Ok I'm having light cramping and my period is due today. However, I've tested positive for the last 4 days! I have had a chemical in the past and I'm just so afraid it's going to happen again. Please tell me I'm normal for obsessing over this? I'm losing sleep! Which is so not healthy! ugh. I just wanna know that cramping is normal and I may not be experiencing another chemical pregnancy!