Aw mama, totoo talaga what your OB said, genetics is really the biggest factor, so don't blame yourself for the Bio-Oil kasi kahit gaano ka-diligent, if it runs in the family it's just gonna happen, you know? A few of us tried everything from second tri pa lang but still got them, so you're not alone dito! For lightening them during pregnancy, I'd suggest trying Mama's Choice Stretchmark Cream & Serum together, they're pregnancy-safe and breastfeeding-safe, and honestly a few of my mum friends swear they helped minimize how dark the new marks got (plus they smell amazing so it's actually enjoyable to use haha). As for removal after pregnancy, that's more a dermatologist conversation since you might need laser or other treatments, pero the good news is they do fade significantly on their own over time, lalo na in the first year postpartum when your skin tightens back up. Hugs!