Sorry to read about your difficult journey
I have had two IVF cycles at two different clinics, one with BCP (Clinic 1) and one without (Clinic 2). However, both cycles were different in other ways too so the egg numbers canít necessarily be put down to pre-treatment with BCP.
I donít like the BCP so was reluctant to use it but went with the insistence of Clinic 1. They said it was to prevent a pregnancy before treatment, which I found very patronising! Clinic 2 didnít mention BCP so I didnít take it as Iím very regular too (28 Ė 30 days). They just said I need to use some method of protection.
Cycle 1 (with BCP, antagonist protocol, Gonal F 250): 9 eggs, 7 mature, 5 fert, 4 to blast
Cycle 2 (without BCP, long protocol, Menopur 150 and Gonal F 112): only 4 eggs, 3 mature, 2 to blast
My baseline hormones (FSH, etc) are good and my AFC is good for my age 37 (clinic 1 said 12, clinic 2 said 25) so was disappointed with number of eggs. For Cycle 2, one of my ovaries had a big follie early on so probably suppressed the rest as I only had two follies on that ovary. I was also wondering if the lack of BCP caused one follie to run away from the rest. Long protocols, in general, are expected to yield more eggs compared to antagonist, for normal responders.
Iíd phone your clinic and ask their advice. I have my review on 29th April so will be asking the same question as Iím in two minds too. Sorry I canít say, one way or the other, but I would consider taking BCP next time to hopefully avoid a dominant follie/get them to grow evenly.
All the best and let me know how you get on xx