Hello, I'm wondering if anyone else has had this issue. If there's a way to search for this in this subreddit, feel free to let me know - I'm still pretty new here :) My periods are regular but I think I ovulate later in the month and have a shorter luteal phase. I discovered this when I was doing IUIs and having to test daily for my LH surge. This month, I'm meant to be doing a natural cycle frozen embryo transfer but my day 10 and 12 blood tests show low oestrogen (in fact, day 12 is slightly lower than day 10). I think it's to be expected and it will rise but my clinic nurses said that if my oestrogen is still low on day 14, they will just cancel this cycle and move on to a medicated cycle next month. I really think it's too early as without medication, I've had LH surges on days 20-21 previously. If anyone has had/heard of this, please let me know as I can't find info from the research I've tried to do. Thanks!