Lots of women experience increased discharge but just because it doesn't smell, itch, or burn doesn't mean it's not an infection. You'll still want to get it checked out. Pregnant women are highly prone to Bacterial Vaginosis and it can go without symptoms all the time. It's also extremely important to treat during pregnancy.
I had discharge in my first few weeks and I wound up testing positive for BV and had to take antibiotics to clear it up. Now I have discharge again but it seems different so I'm pretty sure it's not a recurrence.