Aw, I totally understand ang worry mo, ganyan din ako noong may unclear results yung ultrasound ng anak ko noon! The "cannot be evaluated" thing is usually just because ng positioning or quality ng image that time, hindi necessarily may problema, pero honestly kailangan mo talaga mag-follow up with the doctor who did the ultrasound to explain kung bakit left hand lang ang hindi clear at kung may need ng repeat check or if it's just normal variation. A few of us mums in the group nag-experience din ng ganito, and after follow-up, usually okay lang, pero importante talaga marinig straight from your OB kung ano talaga ang meaning nito para sa peace of mind mo!