Oh, I used to measure my bump every week and worry if it stopped growing or was too small! But my doc assured me that every bump is different. Don't stress too much about the size, as long as your scans are fine, baby is growing perfectly.
Because of my thyroid, my baby's growth was monitored very closely with regular ultrasounds. Your belly will keep expanding till delivery, but make sure you are getting your regular scans done. Doctor will track the baby's exact weight to be absolutely sure.
Actually, your belly keeps growing right until the very end because the baby is gaining weight. Around the last few weeks, you might feel it drops a bit as the baby moves down. It is a beautiful sign that your body is getting ready for delivery!
It really doesn't stop growing until you deliver, you just have to keep adjusting your maternity clothes! I had to buy bigger sizes even in my 9th month to stay comfortable at work. Just manage your comfort and keep going.
Honestly, my belly felt huge right up to my scheduled C-section day. Even after delivery, it takes some time for the uterus to shrink back to normal. Be very gentle with your body post-delivery, the recovery takes its own sweet time.
I had such terrible vomiting that my belly barely showed in the first half of my pregnancy. But once the sickness settled, it grew continuously till the 9th month. Just focus on eating whatever you can digest, your belly will grow at its own pace.