20 weeks pregnant discharge ???

Girlies I’m 20-21 weeks pregnant and sometimes I get pale light brown discharge. It’s not heavy, and it’s only a wipe of it, and then it goes away. Or I’ll notice a little bit on my panty liner. I just had my ob sonogram and my baby girl is doing fine and everything, but I was a little anxious about the light brown discharge. I do not get it every single day, I also have light cramping which I have had since 11 weeks on and off. But I’ve noticed more light cramping and middle back pains. My baby is very active and kicks and moves all the time so I wasn’t sure if the light cramping had something to do with the kicking? This is my very first pregnancy so I’m not sure what to expect. I’m a small person so my ob said the cramping was normal but I just feel like I need confirmation from mother moms!