For me, standing for too long and walking continuously triggered Braxton Hicks contractions in my 8th month. I had to sit down immediately and drink a big glass of water to make it stop.
Sometimes doing sudden heavy stretches or overdoing exercises can do it. I only do light walking and specific prenatal yoga poses that my gynac allowed me to do.
Honestly, stress, dehydration, or even sex can trigger mild contractions as you get closer to your due date. Just listen to your body and don't overdo things, cool?
Nipple stimulation can also trigger mild contractions because it releases oxytocin, which is the same hormone that helps in milk letdown later. Keep track of how often they are happening.
My doctor at the private hospital told me that even a full bladder can cause mild contractions. I kept their emergency helpline number handy just in case, you should also ask your hospital for a clear list of triggers.
I totally understand how scary it feels when you start getting those tight sensations. Your body is just preparing to meet your beautiful little miracle, but please rest and drink some warm water.
Dehydration or even mild UTI can trigger early contractions, which can be risky. If you are feeling tight cramps or pain, please don't wait at home and call your gynac immediately.