IVF for baby #2

MissJelly
We had baby #1 via IVF after 2.5 years of ttc and both male and female infertility factors. I have endo, adeno and polycystic ovaries and my BF has low sperm count. Thankfully we were lucky first round and have 4 embabies frozen to use later.  Baby #1 is 8 months today. I'm due to go back to work in May 2016, when she's 13 months and I would love to be pregnant then or at least have done our first FET. 
Anyone else gone through a frozen embryo transfer? Any advice / recommendations for what to expect or what I should ask the dr?
My apt with the fertility specialist is tomorrow. I'm excited but a bit worried as my endo pain has stopped and I know feel pregnant after every ovulation until my period has passed.