Hi frank, I'm currently 22 weeks pregnant following IVF (2nd frozen transfer) and have had endo for years so hopefully I can help...
I still had 2 ovaries at egg collection, but only just - one was pretty knackered after repeat removal of endometiomas, and had little ones (about 3cm each side) when undergoing IVF.
Standard protocol at my clinic was max dose of stimulation drugs to counter balance the endo but I ended up overstimulating - my good ovary had 25 follicles a few days in! they were doing regular scans and changed the regime so I didn't get too ill though - just moderate OHSS - but something to watch out for.
Endo wise, the pain stopped almost as soon as I fell pregnant, I just get the odd twinge. The cysts are still there but aren't getting any bigger or causing any problems.
Other than the usual pregnancy symptoms (nausea, sickness, constipation, tiredness) my first 20 weeks were pretty good - a wee bit of spotting but nothing to worry about. Ended up in hospital at 20+3 with heavy bleeding due to low placenta though, and haven't been 100% since. It's not directly related to IVF but is slightly more common, so again something to watch out for once you hit the half way mark.
I'd never used internet boards before IVF but they were an absolute godsend through the process - it's an emotional roller coaster and we didn't tell our families or colleagues etc, so having somewhere to share experiences with women in the same boat was great. I regularly use the fertility zone site, which has groups for each clinic, and was great for getting info about the clinic specific policies etc.
Anyway, all the best for your treatment and please feel free to ask if I can help with anything x