Levothyroxine & irregular periods/fertility

Hi there, I'm new to this and completely at my wits' end. All advice gratefully received. Here's my background... I'm a 29 year old female, relatively healthy, no other medical conditions. 5 months ago I was diagnosed with an underactive thyroid; TSH at 18. I was put on levothyroxine 50mg to start with. Follow up meeting, this was increased to 75mg as TSH was 4.0. My latest reading showed TSH of 1.4 so no change to dosage.

Here comes the strange part. All my life my periods have been like clockwork, even when I was not receiving treatment. I'm 29 and desperately want to start a family, so much so my partner and I purchased a fertility clearblue fertility monitor 9 months ago. All the way through up until 3 months ago, my periods were regular and my fertility peaked and troughed as it should. But now, it's all over the place. My periods are complelty irregular, ranging from 18 days to 35+ if at all. My fertility doesn't peak, and this all started 2 months after starting Levo.

I double checked the patient leaflet, noticed it asked to call the specialist if menstrual cycle changed, did so and I really really feel like I've been fobbed off. Basically told "under no circumstances is it the tablets and there's nothing more i can do for you".

Given I want to try for a family so badly, not sure what I'm supposed do. Has anyone else experienced this? I'm 29 and based on what the specialist has said, I'm majorly concerned I'm now going through early menopause!! In my mind, there's no doubt it is the tablets, but if the specialist doesn't believe me / think so, what am I supposed to do?

If you've made it this far, thank you for reading! I'm so so worried we won't be able to have a family because of these stupid tablets. Feel very much rejected by the system - take the pills, original symptoms cured, not the specialists problem anymore.

again, thank you xxx

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