Should I call my doctor?

I am 5 weeks 5 days. Yesterday I worked with my grandfather it was not a lot of activity but more than i am used to since I've been pregnant and I started getting some pelvic pain on my right side. Then today I was walking up the stairs with a heavy laundry basket and it started happening again. Both times it happened I stopped and took a break and it stopped hurting as much. It's not a severe pain but it is uncomfortable. What could it be? Should I call my doctor??