*TW* I have a 16 month old son from IVF. I posted on here during my IVF journey that led to him

Anyway, I have a consultation with my RE on Thursday. We are planning to do a FET and have 5 frozen blasts. My question is for anyone who did a FET or IVF after having a child/ children. What tests did you have to do second/ third time around? It hasn't been that long since I've been there, and I know they will need blood work and do an ultrasound. What else should I expect? I'll be bummed if it's a lot of testing! My biggest worry is that they will find polyps again. I had a few before, and had to have a hysteroscopy (I think that's what it was) to remove them, and that sets you back time-line wise. I also hate the HSG saline thing and hope they don't make me do that!!! Any insight would be helpful. Thanks!
Me: 33, DH: 40
July 2016: IVF #1 (froze embryos)
Aug. 2016: Hysteroscopy to remove a few polyps & Laparoscopy
Oct. 2016: FET #1 BFN
Nov. 2016: FET #2 BFP (ended in CP)
March 2017: IVF #2 Fresh Transfer of 2 Blasts = BFP!!! (EDD: 11/27/17)
Froze 5 Blasts
DS born on 11/2/17!!!
Back to try for Baby #2

Re: FET for baby #2
TTC - since 2014
7 rounds of Clomid - BFN
IUI #1 - October 2015 - BFN
IUI #2 - November 2015 - BFN
IUI #3 - December 2015 - BFN
IVF #1 - March 2016
Retrieval #1 - April 2016
FET #1 - May 2016 - BFP!!! DS - Born January 2017
Trying for baby #2...
FET #2 - January 2018 - BFN
No more embryos left; switched to a new RE
IVF/Retrieval #2 - January 2019
IVF/Retrieval #3 - March 2019
FET #3 - April 2019 - BFP!!! - DD: Born December 2019
Trying for baby #3...
FET #4 - October 2021 - BFP!!! - Due June 2022