Methylfolate and folic acid both support the same early pregnancy need, protecting your baby's neural development. Methylfolate is sometimes preferred for women with a specific gene variant that affects folate processing, but for most women planning pregnancy either works well. Cor 3 and Pregnacare are both standard prenatal multivitamins, so this isn't really an either-or decision.
Next Steps
Since your doctor already chose a supplement for you, it's best to continue that rather than switch on your own. Please also see your gynaecologist about your last pregnancy loss, so your preconception plan accounts for why it happened.
Health Tips
Please don't pick between supplement brands on your own, especially given your history, let your treating doctor make that call.