is this something I should be worried about...?

Alexis • Deonte jr 💙
I have had cramps from gas and upset stomach for the last 4 days and just has gotten worse. Today my cramps feel like they are all the way to my asshole... I had a miscarriage in aug 2016 and I'm currently 5 weeks pregnant as of Saturday. One minute I feel like I'm going to die and the next I'm fine. Also have had a fever since my pregnancy has started... any explanation????