How can I conceive if being on Levothyroxine is causing my periods to go crazy

[Elouise2000]

I was diagnosed with an under active thyroid about 31/2 months ago my doctor started me on 50mc of Levothyroxine and was still having regular periods but then my doctor upped the dosage and now my period is late( I am not pregnant, done a test) my partner and I are trying to conceive but i’m Not sure how that will happen if my periods are irregular, p.s I also have P.O.S

Hi I will reply later in more detail not much time now.

Please write down your last blood test results.

Also, are you taking any supplements?

Also what age?

What is POS?

My last test said I was borderline( not sure exactly what that means) i’m 36 years old and POS is policistic ovary syndrome

Ah yes thanks. I'm not knowledgeable about the pos as I think that's a different issue but I wouldn't try ttc until you know your thyroid levels are stable ie you've stopped changing your dose for a good 3-6 months.

Low thyroid hormones can cause miscarriages so you need to make sure your tsh is around 1 or below, definitely below 2.5 before you ttc.

As soon as you conceive (around 6 weeks) take a test and ideally start taking an extra 25 mg then test again 4 weeks later. but I'd speak to Gp about all this before hand and get a plan of action in place with them.

Please read this and take to gp if possible

www.btf-thyroid.org/projects/pregnancy/375-pregnancy-and-thyroid-disorders-guidance

Your periods could be being affected by your thyroid issue.

Thyroids take a while to fully settle down, the medication takes a good 2-3 months to build up to proper levels.

Close monitoring in early pregnancy in important for mum and baby - don't worry too much though as the fact you're on some thyroxine is great. I'm on 125; during pregnancy I went up by 25 then another 25, then dropped a little in the third trimester by 12.5.

Ideally You also need to have been taking folic acid and vitamin d for 3 months prior to conception; iodine is also important for early pregnancy if you don't eat dairy or white fish, so a pregnancy multivitamin can be a good idea.

Thank you this is really good information, I really appreciate your help

No problem not all gps are up up speed with this. Midwives don't cover it either.

You often get seen by a consultant around 12-14 weeks but the main time frame to check thyroid levels is in the first trimester so it's a bit of a loop hole.

Get all your ducks in a row so to speak: tsh around or below 1 for a good few months, take multivits and let your cycle settle. Then ttc - your pcos May have settled as a result, I'm not sure. But get the thyroid side if things bang on first.