If you are concerned you NEED to know. I strongly recommend having at least your TSH tested and pursue further (T3/free4) if anything seems amiss.
Bottom line, whether you are hyper or hypo, it's known to help both. It can effect these levels - it can cause hypo in SOME if too much is taken. The amount you're using is so nominal I think the issue is benign.
But I'm only a pedestrian in all this. SEE someone if concerned. TSH labs are cheap and routine with any basic CMP testing.