I'm 26 weeks pregnant with my first. I felt my first movements at around 19 weeks, and they've been pretty frequent since, although there's no clear pattern to when I can feel them... it's on and off throughout the day.
I have a few pregnant friends who have gone for monitoring whenever there has been a few hours without much movement. This isn't super common for me but probably happens once or twice a week.
I asked my midwife at 24 weeks, and she said that from 26 weeks, they'd monitor me if I felt movements had reduced - but that after 3 incidents, I'd be referred to make sure there was nothing wrong with the baby, and I was coping okay. That seems quite different to my friends' trusts; who don't seem to have the "limit" - one has been in weekly or so so far.
Should I be going in whenever I think baby is quiet? Sometimes I think it's just because I'm busy - sometimes they just seem quiet. Today, for example, I felt kicks earlier this morning and in the shower, but nothing big in the last few hours. Yesterday they were wriggling around all day! I feel like I'd be in a lot if I went in whenever baby has a quiet day, but it is a bit anxiety inducing, and I don't want to be getting this wrong!