When I tighten my stomach muscles my entire stomach moves to the right?!

I do notice that my sweet girl prefers to stay on my right side. I actually was thinking today I haven't noticed her on the left once. She's on the right or down in my pubic bone. But sometimes she will kick over into the left side. But now I notice when all my stomach muscles tighten like when I'm starting to stand up or anything that my entire stomach shifts to the right. Is this normal? Nothing is hurting on my left side but it just seems really really weird! I'm 26w5d