I did IVF and transferred two 6 day old blastocysts that were grade 1 ( the best) from an egg donor ... I am 33 years old in perfect health besides endometriosis taking over my ovaries leaving them no functioning .... They were already hatched when we implanted ... I have done HPT which were all negative I'm currently day 8 post transfer and my Beta is in 2 days .... what is our percent chance of being pregnant with a negative HPT 8dp6dt ?