Hi mama! Honestly, vitamin C during pregnancy is super important, but I'd really recommend checking with your OB first kasi they know your complete health picture and can suggest the right dosage for you, some of my mum friends nag-take ng regular vitamin C supplements, pero better safe than sorry talaga, especially when you're 20 weeks na. Your doctor can either recommend a prenatal vitamin that has vitamin C na, or suggest a separate supplement if needed, para sigurado na safe at enough ang amount for baby.