Sis, yan ang melasma or chloasma kaya common during pregnancy! The hormones talaga ang culprit, and sometimes it's uneven kaya parang may pattern, mine was like that din, darker on one side lang, it was so weird. A few of us in my mum group had the same thing, and honestly marami nang nagexperience nito, so you're definitely not alone! The good news is most of it fades eventually after delivery, though it takes time; just make sure mag-SPF ka talaga every single day kasi ang sun exposure lang ang mas nagpapadarken nito. You can also try Mama's Choice Face Moisturiser & Face Serum while you're pregnant since they're safe, and they help keep your skin hydrated which can help manage it better.