Pulling a muscle?

So its not the first time its happened but I stretched my right leg out last night and got a horrible shooting pain that felt like massive period cramps/contractions but just in the right side. I held my side and had to really focus on breathing through it and just had to remind myself it wasn't that bad and I couldnt feel it in my left so it was definitely from stretching not labor pains. It lasted a solid 3 minutes then went away. I've experienced about 3 or 4 of these in the past week and a half or so and was wondering if anyone else has experienced something similar?? I'm also 34w+5d.