Luteal phase...HELP PLEASE

M.E.L • 33🇬🇧Baby #2 due August 2024💕 6 failed IVF attempts, 3 miscarriages 😔🥚 Egg Donor🥰
Hi ladies.
I've read a few things to help lengthen my Luteal phase. I am currently sitting on late ovulation, anywhere between CD19-CD21. I get awful ovulation pains also but my period normally shows its face between CD28-CD30. I am curious to know if you think this is a long enough time to actually implant? And could this be the simple reason after 6 years of trying I haven't fallen pregnant? I just need some advice and support. 
I am currently on CD23 with weird ovary tingling. Fingers crossed!!!
Thank you in advance xxx