Flexeril while pregnant

Had anyone had any experience taking Flexeril (Cyclobenzaprine) while in the third trimester or while pregnant period? 33 weeks now with my second pregnancy, I get horrible horrible pelvic pain, like almost on the verge of crying , and so my ob prescribed them for me to take. I’ve only taken them on two separate occasions when I just absolutely needed SOMETHING for relief and while they helped tremendously, I still worry and overthink about side effects and possible harm to my baby.