TSH level at 3.26

Lara • 26 • married • melb, Australia • first pregnancy •
Hi guys I'm currently 36 weeks pregnant and just got home from my appointment, they told me my TSH level came back at 3.26 (thyroid) they've said the range during pregnancy should be under 3 so mine is over, meaning the thyroid is underactive.. I'm
Really stressing out now as I'm the paranoid type, today we had more blood tests and will find out more about this next week but has anyone experienced this? I've been googling things which I shouldn't be but its freaking me out as its saying during pregnancy it's not very good and could affect the fetus. Someone help me :( so stressing