So I am 21 weeks. Having severe and debilitating “spasms” from pelvis to rectum. Went from a 30 min span 3 days ago now going on a 4 hour span today with huge waves of these intense like spasms. Finally today my OB is prescribing a muscle relaxer Flexeril and sending me to Urogynecology and a pelvic floor therapist. I have been doing pelvic floor exercises since this occurred this week. She says my cervix is closed and baby is doing wonderful. Some pregnancies cause a weakened pelvic floor. But this is so intense going on day 3. Any advise or experiences?