[pasting some of my own post from the nursing mamas ttc, so sorry to bore you if you're following both threads! ]
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Update:  I went to the endo today for a checkup for my thyroid, and discussed the short LP thing with him. He said he believes it is not thyroid related, and is purely due to breastfeeding. He thinks that even though I've been cycling (and ovulating) for a while, my repro hormones are suppressed enough by nursing that the LP is short. He said he wouldn't worry til I've TTC'd with no success for 4 cycles AFTER weaning. He expects that after weaning, the LP will lengthen automatically to 12+ days. I was hoping to get preg in the next couple of cycles and nurse while preg for a few months. I suspect an OB would say the same thing, I was just hoping for a quick solution/easy fix.
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So, I'm kind of disappointed that it can't be simply 'fixed' by adjusting thryoid meds. (Got the test done today anyway, results are yet to come and adjustments may be needed, unrelated to TTC). DS shows NO signs of being ready to cut back on nursing. Besides the calories, he just likes to nurse and I like the BF relationship.  I understand that nature built in some lacation-induced infertility for most women for a reason, to focus on the baby you already have. I just didn't think I'd fit into this category since I've been cycling so long already. So now I'm trying to wrap my head around the possibility of having to wean DS before being able to conceive. I'm not willing to try to wean DS until he's 2 years old (Nov). I just don't think it's fair to him to force him to wean now when he needs it so much and he's still quite young, just so I can get pregnant now.
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Maybe my LP will lengthen by itself with no change in nursing (fingers crossed, though that would defy logic at this point!)Â We had hoped for about 2 years bw kiddos, but maybe that's not meant to be for us, and our kids will have to be farther apart.Â
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As for my other hypo 'symptoms' - graying hair, lack of weight loss since 4 wks PP despite so much nursing, feeling tired (which ironically I forgot to mention to the doc- sheesh!)... we'll see what my TSH/T4 test says. Endo says he'd like to 'max me out' on the levothyroxine - I think in part bc I"m ttc and will need more once preg, and in part for symptom relief. So I might be in for a dosage adjustment soon... not sure yet.
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I asked about also using T3 supplementation and he said he doesn't like to unless really necessary bc doing that means the tests for T4 can't be read well bc the T3 makes it look like T4 is different than it really is. Not sure I understand that fully, but I was just asking anyway since I read stuff online, not bc I really wanted it for myself right now.
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Also discussed Armour with him, he's not into it bc he said not only does the dosage vary from batch to batch, but you're getting more than your body gives itself - ie in addition to T3 and T4, you're getting actual animal thyroid tissue since that's ground to make the grains. It was interesting to hear his opinion. I'm comfortable with levothyroxine for myself for now anyway, so again it was just an informational thing for me.