Low progesterone or short luteal phase stories please..

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Anyone here struggling with low progesterone or short luteal phase? How did you find out the problem? I feel like since getting off Mirena in December my cycles are so short (24-27 days) and I start spotting 9-10 dpo every cycle. I don’t know if I have an issue or not but since my chemical pregnancy last month I wanted to find out for sure if everything is ok or not with some blood work at least or something but the doctor pretty much blew me off.