12 fertilized, 8 made it to freeze - is this average?

Sarah • The Woodlands, TX Married to the man of my dreams since 2012. We are both 40. We each have daughters by previous partners, and have been TTC for almost 6 years.

We had 14 retrieved, 12 fertilized, 3 made it to blastocyst on day 5,

5 more on day 6 (today). Doc says we'll transfer after PGS testing, SIS procedure, a week of birth control followed by estrogen patches and progesterone injections...so about 4 weeks from now.

Is 8 blastocysts about average?

I'm 40 with 3 children, non specific secondary infertility.

Any guesses how many we could see viable after our PGS testing?