your fundal height can change day by day, depends on how the baby is laying that particular day etc etc. I was always up to 6cm below my fundal height. At 35 weeks I would measure 29, so on and so forth. I had all 3 kids early, 2 by inducement the last naturally, and apart from being small when born 6lb, 6lb 7oz, and 5lb 13oz they were all healthy.