Trying to get labor going with sex

38 weeks and got busy tonight with hubby trying to get labor started. It was ok but reaching orgasim felt weird because I was having a contraction at the same time. My issue since the deed is baby is moving ALOT!!!  like she is angry or something. Her movement hurts!!! I don't feel contractions just her movement. Anyone else had this happen? I have never had sex this far along being pregnant but am desperate to get labor going so idk