Does anyone know if it’s normal to cramp at 21 weeks pregnant?

It’s super uncomfortable and it’s worrying me. I actually went to my doctor earlier today to get tested for a UTI and she told me my urine was “thick” and I needed to drink more water. I’m just so achy in my belly and I previously had a miscarriage (but that was at 6 weeks) but I’m still worried about every pain I feel!! Any help is appreciated 😞