Ay, don't worry, I haven't personally used Vagilin pero a few of my mum friends had BV during pregnancy and they said the discharge color can definitely be affected by the medication itself, lalo na kung may color ang applicator! Pink discharge while on treatment is usually normal lang, pero since you're already on cefuroxime for the UTI at 9 weeks, mas better na i-update mo agad ang OB mo about the Vagilin so she knows everything you're taking, sometimes may interaction concerns o she might want to adjust kung may isa na enough. Sana mabilis mawala lahat at healthy ang pregnancy mo!