Omg I'm 21 weeks and seriously exhausted, I thought I was past this 😫😫😫

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I swear the further along I get the more harder it becomes to breathe 😫😫😫
Short Luteal Phase?
I've just started temping because I believe that the reason I haven't had a BFP yet, after 20 months, is because I believe I may have a Luteal Phase Defect.