If you do feel a sudden decrease in your babys movements then get assessed straight away. I went in at 38w3days with decreased movements thinking that it was just because she was too big to move around (I read it on the internet) but it was a sign that something was wrong. I had an emergency c-section within 2 hours as my baby was in distress. The medical team later told me that if I had waited until the following morning then the baby would of been severely unwell. Thankfully she was born without complications and has been blossoming ever since! If your ever worried, please always go in to get assessed no matter how many times you go in X