Discharge question 34 weeks - TMI.?

I'm 34, almost 35 weeks pregnant and for the last week I've been having some change in discharge and a lot more of it. I know it's common to have an increase in vaginal discharge but something about this doesn't seem right to me.

I've been wearing pantyliners and the discharge seems streaky, brown and dark yellow. It doesn't smell like urine and happens even when there's been no pregnancy incontinence and just after I wipe thoroughly after using the toilet. It's not stringy or mucusy and there's no red blood but it's shiny like normal discharge. It seems like a light brown streak or stain rather than a normal pattern of vaginal discharge and I have no UTI or vaginal infection.

Does anyone have any idea? The midwife doesn't have any advice to offer and has no idea what it is and I don't have another appointment with my OB for a cervical check until the 19th.