Nak, this is really something na kailangan mo talaga i-discuss with your doctor asap, especially bukas sa blood test mo, okay? Hindi ko dapat mag-guess dito kasi complicated talaga ang situations na ito, at kailangan mo ng proper medical assessment, hindi lang pregnancy test. A few of my mum friends have gone through confusing ultrasound findings, and honestly, ang best thing is to be honest with your OB about lahat ng details, what they saw before, what they don't see now, all of it. Your doctor will know what the blood work means together with the ultrasound, kaya focus ka na lang sa pagpunta bukas. Try not to worry yourself sick in the meantime, ha. Marami pang possibilities, pero only your doctor can explain what's really happening. Praying for you, nak.