Woke up this morning and could not move!

Im 15 weeks pregnant. I have a hard time getting in a comfy position. When my alarm went off I realized I was laying on my stomach. I could not move out of this position. My whole right side seemed to be cramping and real hard. I layed there for 10 mins and it kind of eased off. Took a hot shower to relax my muscles. Should I call my ob nurse? I have to work today as a nurse tech.