TTC with under active thyroid

Anyone TTC with an under active thyroid?
We have been trying TTC for 6 months now and I have long cycles and irregular periods. 
I am being treated with thyroxine and went to gp to check bloods. My TSH result was 3.3 and normal range is 0.3 to 5. But I have heard optimal range for TTC is 1-2. Thankfully GP increased my dose and aiming to get results a bit lower. 
Anyone been through this and then got your BFP once your TSH levels were lower? 
Baby dust to all 😀