Discharge question!!

Samantha • Married to the love of my life. Healthy 1st baby (boy) 10/07/14 after a long road to pregnancy. Couldn`t be happier!!!!
Just wondering how much discharge you are all getting and what is normal?? I am just over 28 weeks pregnant. I change my panty liner 2-3 times a day and the last couple weeks I am definitely getting more and more, it's like I'm constantly feeling gross down there and uncomfortable because of it! 
​Just wondering if the volume I am experiencing is just normal or if I should bring it up to my doc? Thanks!