I just had my first ultrasound and my cervix only measures 2.9 cm long. I have a know case of incompetent cervix. Im more nervous now because Im only 6 weeks pregnant. Im going to have a transvaginal cerclage at the 13 week mark. Has anyone ever measured this short this early on? At this point with my son my cervix was almost 4cm & I still had him at 26 weeks! I dont know what to do..... Can anyone give me some advice???