Tailbone pain is often caused by the pelvic ligaments loosening and shifting. During pregnancy, your body releases a hormone called relaxin. The hormone makes your pelvic ligaments looser and more flexible to make room for the baby to grow and enable you to give birth.
Im having this right now from wk34 started w mild tailbone pain, till now wk36 i barely can walk much in a day. Prolly just at home. If i head out i walk abit i prolly super pain until i wanna cry.... T.T.