Any chances of fetal abnormalities after oscar scan?

Hi, would like to ask if there is any chances of fetal abnormalities even after the oscar/fetal scan in week 13 & 20. I am in week 33 now, i still go for my routine checkup but jus wondering if there could be cases of undetected abnormalities.

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the checks are scheduled in those weeks because those are the crucial milestones to detect any abnormality. after that the risk is less likely. best to check with your gynae.