Can Hips And Pelvis Widen After Puberty?

Hi, i am a 20-year-old female, and I am just curious whether secondary sex characteristics still continue to develop even beyond puberty. Particularly, can hips and pelvis still widen even after puberty given that the level of estrogen in our body system is increased naturally? I am just worried that i may not be able to carry a baby to term or that i may experience pregnancy difficulties since my hips are narrow. Not to mention how i am carried away with the stories i have heard from those who hips not wide enough to home a baby. thanks in advance, and i really hope you would give me the answer that i have long been looking for.