I am having pain in my pelvic area (pelvic bone) is it normal?

After and even before when i lay down or walk i am having serious pain on my pelvic bone and on the pelvic bone on each side of the . I am 15 weeks pregnant and been to the hospital once about it the diagnosed me with BV (bacterial vaginosis) i was given an antibiotic and it slightly went away but is back and hurting bad to where i can barely walk is this normal or am i ok?? is my baby ok??