Honestly, brown discharge during pregnancy is usually just old blood, a lot of us moms experienced it, especially in the first trimester, kaya don't panic agad! But since it's your health and baby's health we're talking about, mas better pa rin na i-mention mo to your OB sa next visit or call them if you're worried, lalo na if it gets heavier or may cramps na kasama. They'll be able to check you properly and give you peace of mind, sis.