Tail bone

Cierra • Hey y`all I`m cierra, 21. We have a 3 year old daughter, Scarlett and another due april 24, 2015
Im 13 w 4 d and ive noticed around 10 weeks that my tail bone is extremely sore. Doc told me its normal because the ligaments that expand my uterus are attached to my tail bone too. Anyone else experience this?