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1 Labor contractions may feel like menstrual cramps. 2  Really bad menstrual cramps. 3  At least, that's the most common description that's bandied about.  4 It starts out like menstrual cramps -- and the crampy sensation progressively gets worse and worse, Dr. du Treil says.5  You may feel the uterus tightening.till, there are a few clues that what you're feeling is actually labor contractions. 1  Labor contractions may feel like menstrual cramps. 2  Really bad menstrual cramps. 3  At least, that's the most common description that's bandied about.
This is contraction happening, and then the muscle relaxes and it goes back to how it was before. Contraction happens, the muscle relaxes, and then it goes back to how it was before. To put that in perspective, this is me working out in the gym, and as I contract the muscles in my arms, this is what happens. So, my bicep muscles contract, I pull it up, you can see it shortening. The sarcomere is getting shorter.