As an "older mum" who went through several rounds of IVF for number 2, I wish you best of luck on the very emotional and, let's be honest, draining journey that IVF invariably is.
I just want to say something that I hope won't come across as unsupportive: at 43, the probabilities are not on your side. You might be lucky, but you may not.
If your objective is to have two children, please keep in mind donor egg conception. I ended up resorting to that for number two, after trying unsuccessfully with my own eggs (started IVF at 42 for second one, having conceived and given birth to the first one at 40 with no issues). It was also an emotional journey, and a big feeling of failure for not being to have my "own" (genetically) child, and worries if my two children will feel "different", given only the second one was donor-egg conceived. However, now my second is nearly four years old, I wouldn't change it for anything, because, of course, they are my child, whom I carried and loved from the very beginning.
I have been lucky to meet other women in the same situation since giving birth, although when I was going through the process, it felt like a very shameful / secretive thing to do. We used a clinic in the Czech republic. If anyone wants a private chat on the topic, please feel free to PM me.
Best of luck,