OB not concerned about low TSH

Anyone else have a low TSH level on there prenatal bloodwork!? Just did my 12 vials and the TSH was like super low… it was within normal range with my first so I messaged my OB and she wasn’t concerned and said this is common in the first trimester and we will just check again in the 2nd trimester bloodwork but I’m worried that it could be bad for baby if we don’t correct it soon enough? I went down the rabbit hole on this app and people mentioned cretinism 😳 I’m not sure if this is more related to hyperthyroidism rather than hypo??? But my OB wouldn’t just brush it off if ir was concerning… right?? Lol