Hi,
I did FET and fresh transferred before at KKH.
At 20 eggs, they were already worried that i will have OHSS and did not transfer fresh. Let alone your case of 30... But ur health is top priority. Don't risk OHSS. If touchwood, hospitalized, the eggs might get wasted too with their chances being affected... I had mild bloatedness and was walking like pregnant woman even though no embies in me.
During my ER, i was only given 3 days HL. Which was fine for me, coz no embies in me, stay at home also will begin to think alot.
I don't know of any other way to increase rate of follicle other than injection. Coz u want the follicles to all grow at the same rate and all to reach 17mm. My case, some reached, some did not, out of 13 follicles, only 9 were matured, and only 2 workable ones. You want quality, girl!
Take care! Drink plenty of water and I heard royal jelly and egg whites help to prevent OHSS.