hello, I have the same feeling as u, currently wk 21 ftm too, but i did not experience it as frequent as u. doc said it's normal and ya most likely is uterus expanding
I’m at week 23 now. Same on-off cramps like period cramps throughout the day. Started for few days. Observing it and may highlight to Dr when I see him next week.
I checked, doctor said is normal due to pressure from growing baby. But during inspection, doctor has accidentally injured me and I have light spotting now. Be alert of what your doctor does also while checking.
PY Lin