Hi mama! Yellow discharge in late pregnancy can happen, but minsan it's better to get it checked na lang with your OB para sure, lalo na kung may smell or if you're noticing changes, a few of us had different experiences at iba-iba reasons kaya best peace of mind is just a quick call or visit sa doctor. At 37 weeks ka na, you're so close na, so mas maganda na lang confirmed lahat is good bago mag-labor!