Movement

I am 21 weeks today with my second baby. I thought I’d be able to feel way more regular movement by now, but it’s so intermittent. Is that normal? I had a miscarriage last year and I also have Cholestasis, so it makes me kind of nervous when I can’t feel her moving. Just wondering if anyone else is in the same boat as far as not being able to feel regular movement yet. I know with my first daughter I started feeling movement around 18-19 weeks, but I can’t remember when it became more regular. Thanks!