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Aw, congrats sa pregnancy! I think there might be a bit of confusion lang, "kls" isn't the standard term doctors use here in the Philippines, so I'm not 100% sure what you're asking about. Do you mean the weeks of pregnancy, or are you asking something else like the baby's position or the classification ng ultrasound (like first, second, third trimester)? If you can clarify, I can help better! Most mums here track by weeks and then the trimester, so that might be what your OB mentioned.