Pulsating feeling!

Roxanne • I am a mother 2 of two and one on the way. I maintain 2 jobs and go to school full. I'd like to fine some moral support to get me through this.
I am 37 weeks. I recently started feeling a pulsating feeling in the lower part of my belly. It's not mine or the baby's pulse. It's slower than babys yet at a different rate than my own. Anyone experience this?