MRI with possible pregnancy!

2 days before my MRI my OB made sure I wasn't pregnant, with a negotiate test. 
I had a miscarriage about month and half ago, I haven't missed my period yet but I'm close to my period date (before miscaiage date) I had my MRI yesterday but today, I am having sore best, a break out, and I feel could possiably be very early pregent. If I was durning the MRI of my lower back, what could that mean?? I'm so worried!