Back labor? 🤔

Okay ladies, i am currently 37 weeks will be 38 Tomorrow Monday July 2nd. Due date is July 16th, my SO & i have been having sex to help induce labor but it seems every time we are done and get ready for bed i get the worst lower back cramp/pain along with period like cramps. Usually will last 4-7 hours. Could the pain be because the sex/ semen is helping or should we stop with the sex until after baby comes ?