Pelvic Exam

Cristine • First time Mom, with 4 step kids. Can't wait to meet my baby girl in March 💕💜💕
For the first dr visit did they have an accurate guess on how far along you are? I go on Monday and I think I'm 10 weeks but my PCP says 9. Will the OBGYN be able to tell a week difference just from the pelvic exam?