During pregnancy, your bones get softer and looser, especially in the pelvic area, to make the birth easier.
This loosening of the bones may cause a few tweaks and pains some days. It will vary depending on things like weight gain, posture and the level of the Relaxin hormone in your body.
A lot of women notice the tweaks and pains in the pelvic area. Especially after sitting for a some time and then standing up again. The pelvic area loosens and widens naturally during pregnancy, to allow room for the baby’s head to pass through at birth.
If the pubic bone area does get too painful then consult your doctor. You could be recommended to wear a support belt. The loosening of your bones and ligaments may lead to other problems, like nerves getting trapped – see Sciatica.
Pregnancy could change your bone mass.
If the mother does not have a high enough intake of calcium during pregnancy, then her baby may get provided for by the body. The body will start to draw the necessary calcium it needs directly from the mother’s bones.
However, the body is cleverly designed because increased need for calcium is counterbalanced by the increase in the hormone estrogen. Estrogen serves to protect the bones during pregnancy. During pregnancy, the body has increased levels of estrogen.