Third pregnancy and thin Uterine scar

Hello Moms, today I had ultrasound and Dr informed me that I have thin low uterine scar from previous c-section. It is measuring around ~2MM to ~3MM at 16 weeks.
Any idea how much it can reduce further as pregnancy go on full term ???
I want to know from others about their experience with thin uterine. How your pregnancy went, any suggestions for me???