So sorry about your loss, I know how much pain you are in right now.
My doc initially said to wait 3 cycles too but when I questioned her about this she gave her blessing to try again after 1 cycle.
I got pregnant again our first cycle trying and am 22 weeks today with everything looking perfect so far - the polar opposite of my last pregnancy where nearly everything that could go wrong did, up until I lost my angel at 14 weeks. Sometimes I still feel like I'm going to wake up and discover that this pregnancy has just been a wonderful dream.
The odds are in your favor that you won't have 2 losses in a row. I hope you get your sticky bean soon and please take extra good care of yourself in the meantime and allow others to do the same.