Anak, I understand your worry, that's such a scary position to be in. Please follow your doctor's advice on the timeline they gave you, kahit 2 days lang, they know your case and what they're looking for, and waiting longer could just make the anxiety harder.
A few of us mums have been through this kind of uncertainty, at honestly, the waiting is the hardest part. The good news is your baby is growing, from just a sac last week to an embryo now, that's progress, and your doctor is monitoring closely. Friday or Monday, go when they say; they have a reason for that timing.
Pero please, if you're feeling very anxious or anything changes before then, don't hesitate to call your doctor or go in, that's what they're there for. Kaya mo ito.