Pulled muscle?

Liz • Pregnant after 3 years of trying after a miscarriage at 12 weeks. Very scared this time around. Hoping for a healthy pregnancy.
I'm 6 weeks and sometimes when I move too fast or stretch I get a sharp pain in my lower abdomen. Feels like a pulled muscle. So I constantly have to get up slow. Or roll over slowly. Has anyone experienced this? Should I be concerned?