8m pp and having weird hormone issues

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I’m almost 9m pp. I have a regular period since December but all of a sudden it didn’t show up this month. I’m having all the signs it was coming but it hasn’t shown. I have taken several tests and all are negative but I’m also having other weird hormonal shifts so I don’t know what’s going on. I never got bo after having the baby which is more common and it’s not super common for me to get it but all of a sudden it’s SO bad and nothing is working for it. Super odd as normally I can go several days without using anything even in summer. I lost all my baby weight early on and then some bc I was producing so much but then all of a sudden within one month I just started packing on the lbs so quickly, it was strange. Anyone know what could be the issue or have you experienced this, later in your post partum? I’m concerned about my period not coming since I’m always VERY regular.