neg hpt test after 11dpt 3 day fet

[Syls]

Ok, here I am on day 11 and I did another hpt this morning. I've been reading on some forums that some people have had negative hpts but got a positive beta test. I have to wait 2 more days before my beta. This is my second fet cycle. I have two more embryos left - fair and poor grade. I had a good and a fair grade embryo transferred. I'm 39 yrs old. Anyone out there had a positive beta after negative hpt's day 11 & 12? I need some encouragement.