My wife started wearing maternity jeans by the time she was 21 weeks.
I got them at 3 months and also a belly band so I would be comfortable
With my first I didn't any maternity clothing but with this 2nd pregnancy I needed them around 20 weeks. Gl
I hate my maternity jeans they are uncomfortable and put pressure on my pelvic areas it socks
With my first 4 months with this baby 39+2 I haven't bought any :) my clothes still fit good! I'm having a girl this time and she was high up till recently when I dropped
I wanted to buy maternity jeans around my 23week but I didn't really like how they looked on me and even the small size looked a little big on me. I'm 29weeks + 5days and I just order a pair of maternity skinny jeans to see if they look ok this time.
I'm 34w and still in my regular jeans. my secret is a rubber band around the button and long maternity shirts to cover it up ;)
I started at about 4 months I started showing early tho too