So sorry to read this Appy
I guess you've both been tested for chromosome problems of course? There's another chromosome thing where you and your DP can be *too* similar but I'm having a complete mind blank as to what that's called! I second the recommendation for testing for sperm DNA fragmentation which doesn't come up in your normal sperm analysis.
How long were you instructed to stay on the immune protocol after starting with your stim?
Have you been investigated for Ashermans (since you've had a few invasive things in your uterus like D&C's) or have you researched Adenomyosis ?? I believe it can only be picked up with an MRI. Bubhub has great threads on both of these things with tonnes of info.
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Have you tried a lipoidol flush? Infections in the uterus can cause early miscarriage also.
I've just found out I'm pregnant with my 5th pregnancy this year (so I SO feel for you Hun ) and while my old FS still did my HRT FET this cycle, Dr DeAmbrosis has tinkered with my drugs and supplements so fingers crossed!!! If it's a no-go, I'm moving my remaining embies up to him and to see if he can work some magic as I haven't tried a few things yet like a scratch or had a lap to check for endometriosis which he suspects I might have.
Truly wishing you the best of luck!!! Xxx