Wats ur pants size during 2nd/3rd/trimester?

Hi, just curious as wondering wat is u ladies can share your pants/shorts size fluctuate from when u r 2nd and 3rd trimester? I just entered my 2nd trimester and wondering if sd start shopping for more maternity wear :) im currently uk12 for bottoms (same size pre-preg) and didnt put on/lose weight after 1st trimester. TIA!