Discharge (sorry for the subject)

Helen
Is anyone experiencing vaginal discharge? I'm 17 weeks tomorrow (due 29th Aug) and I need to wear a panty liner constantly, not a sanitary pad just the thin liners. 
It doesn't smell it doesn't itch and it's not a "funky" colour although can look a bit yellowy. Midwife says it's completely normal but I'm just a bit concerned as it has increased recently. 
I'm just fed up of having to wear the liners! I thought those days would be over for 9 months ha ha!