Ay, this is something you really should check with your OB about, mama, especially kung yellowish na siya, it could be normal hormonal changes, but it could also be something na kailangan ng treatment like a yeast infection or bacterial thing, and better safe than sorry talaga! A few of us in our mum group had similar concerns, and what helped was just having the doc do a quick swab para malaman for sure kung ano talaga ang nangyayari. Generally if it's heavy, may smell, or may itching, yan na sign na time to call the clinic na. Take care of yourself, okay?