Similar kind of experience here - first cycle was in my early 30s, normal AMH, no concerns about fertility issues (same sex couple so needing donor sperm). Consultant was very optimistic I'd have a good response. I didn't at all, and at egg collection they only collected 4 eggs, and only 2 mature. I had more follicles on scan, but consultant felt the eggs weren't mature and sticking to the follicle wall which is why they couldn't be flushed and collected (empty follicle syndrome). We were also on a 2 cycle package, but one which required us to use embryos from first egg collection before proceeding to a second egg collection. We were fortunate that our 2 mature eggs both made very good looking 5 day embryos. Fresh transfer was a BFN and I started bleeding just 5dp5dt so always felt like my hormones must have been totally off and that it never had a chance. Subsequent FET was a CP.
Needless to say, I felt emotionally wrecked after egg collection - so disappointed about numbers, couldn't really understand it, and felt like our prospects of a family were really bad. We took a bit of a break before doing the second egg collection, as I just needed a bit of time to mentally feel up to it.
Second egg collection we changed protocol entirely, as I felt really reluctant to try the same thing as first cycle. So we changed from long to short protocol, changed stims, changed trigger, increased the size they let my follicles grow to and increased the amount of time between trigger and egg collection. I also massively had to readjust my expectations - I went into it knowing I wouldn't respond well and knowing not to expect many eggs to be collected. That cycle we got 6 eggs, all mature. All made it to day 5 but only 3 suitable to freeze - they left the rest to day 6 but none were frozen, and I generally think most day 6 embryos aren't frozen so I'd prepare yourself for that (we did a freeze-all cycle that time as, so fucking ironically, after retesting my AMH to try to figure out why I responded badly they decided my AMH was slightly high and I was at risk of OHSS.... yeah right, kick in the teeth that one was).
However, that second egg collection was an absolute winner. First FET is my DD. Second FET is my current pregnancy (36 weeks) and still have 1 embryo frozen.
So even if you're feeling like it all feels pointless just now - it absolutely can all be turned around.
I think all you can do to pick yourself up is to reframe everything. Stop thinking you're going to get large numbers of eggs (though I would still say 9 is really good!! I would have been overjoyed with 9 eggs!). Start seeing everything as 'quality over quantity'. I threw everything at our second egg collection - I went to acupuncture (actually quite enjoyed it!), took co-enzyme q10, ate a tone of protein and used the mindful IVF app. But conversely, I also stopped putting my life on hold waiting for a pregnancy to happen - we did our first FET just before Christmas, so I just got on with Christmas as usual. I interviewed (and got!) a new job on the run up to the embryo transfer as well.
I'd maybe speak to your clinic about your progression rate - as I said 9 eggs is actually really good. Maybe look at whether there are any sperm / egg quality issues you could work on for your second cycle that would help improve the number of embryos you're getting from your eggs.
Wishing you the best of luck with your next cycle