TMI... Yellow stools during third trimester

Sorry for this gross post.

I’m currently 31 weeks pregnant and today I noticed that my stool was kinda brown but kinda yellow. Like it had yellow spots in it. Some was just all over yellow. This has happened before but I never really thought anything of it but now I do. I have been having gas pains on the bottom of my uterus and I feel like I need to pass a lot of gas. My OB has tested me for cholestasis at my last appt 4 weeks ago and they came back negative. Also don’t have GD. Before I was pregnant I struggled with constipation and acid reflux a lot. Is this normal or should I be concerned??