Hi Kimmi,
As everyone else has said, being upfront is the way to go. I too found that I could schedual things a bit so that I minimised the disruption to work. We ended up having to need to lots of egg collection, and I found that I took more time off the second time (i think a week), rather than rush back to work. Although it did not result in a BFP, I did feel more relaxed and needed that extra time to heal. I got medical certs for everything, and used sick leave as required. My FS was really good in talking through what time I needed off after egg collections etc and providing med certs for that.

For me the other advantage of letting my bosses know (although I did not tell them about each step of the process IYKWIM), was that when I got some upsetting news at work (when our last embie from our first egg collection did not make it through the thaw), I was able to just get up and go home, and did not need to explain why I had to take the rest of the day off work. I only did it once, so did not abuse the system, but I really appreciated being able to do that and not needing to explain anything to anyone.

I too got one of the info brochures from the IVF clinic specifically for bosses and gave it too mine - he really appreciated it (I think ).

Good luck
FG