I know we cycled on the same days and I'm so sorry to see your news. I was just about to post our situation/results and saw your message.
I wish I had some sage advice on FET's vs. fresh. I know there are lots of women on this board that have experience. Frankly, on our 1 successful IVF there was nothing left to freeze so we don't have any experience with FET's.
My instinct is to use your FET's and see how it turns out. That way you can try fresh later, if needed. (Hopefully not though.) That's my instinct - I would use what I have. But I just don't have the experience in this area. I see alot of people post about lab quality, vitrification, etc.
I wish you the best on this journey and am so sorry it was "the" cycle for either of us.