Sayang, this really needs proper medical follow-up, please don't wait, call your KK doctor or go back to get those blood results explained, okay? At 6w6d with a positive test but no sac seen yet, your doctor needs to monitor you closely (repeat scans make sense), and the cyst situation needs clarification too, different doctors can give different opinions, so getting a clear answer from one trusted doctor is important. A few of us mum friends have had early scans where things weren't clear yet, and it sorted itself out with proper follow-up, but the cyst concern is something you really need to discuss properly with your KK doctor or ask for a referral to a specialist. Don't stress alone on this one, get those answers, ya. Thinking of you.