Hi Kim! I can’t speak to the risk of ovulating before ER, but I will say that I had a normal amount of CM before the ER, and some after too. I didn’t notice a huge decrease before ER, it kind of stayed the same the whole time leading up to it. I do know how carefully we are monitored and how the drugs pretty much run our bodies, so I wouldn’t worry too much about it; the docs know what they are doing and I’m sure you will have a successful ER. Everything is perfectly timed for a reason.
As far as how I felt, I actually felt worse two days before ER, so the day of the trigger shot. I felt so bloated, crampy, even like my stomach hurt. The bloating seemed to almost extend up past my uterine area. The day before ER I felt pretty good and not so bloated, actually. I almost felt normal! Then they day of ER, and after that up until I got my period (see signature) I was very bloated. A lot of that was from the progesterone, but some I attribute to the way my body does things - I am always crampy, bloated, moody and tired after ovulation and before my period.
Hang in there and good luck! The good thing is that the heaviness and soreness in your ovaries will go down slowly after the ER. It wasn’t as bad as I thought overall!