Second Biopsy recommended. Is is common? Help!

I'm a 29 y/o f. After 2 masses were dectected i had 2 mammos. Ultrasound/core biopsy. Then an mri. No actual results have been relayed to me. After Mri yesterday, my surgeon is recommending a Mri guided biopsy. Is this common? I haven't spoken to anyone else who had a similar experience.