Lower right abdominal pain?

I’m 8+5, and I am having some weird pains on my lower left side. It almost feels like a pulled muscle. It hurts worse when I move or step a certain way, it doesn’t hurt when I’m just sitting down or standing up. I had an ultrasound on Monday when I was 8+3, and the baby measured right on track with a heart rate of 183 bpm. This weird pain started after my ultrasound. Is this something I need to call my doctor about?