@OhFFSMum - you got to do what feels right for you but to be honest a positive is a positive so you are pregnant!
My 2nd daughter I had two tests, was negative the day before I was due and day I was due period I almost through it away thinking it was negative again but as I sat there and squinted the line slowly formed and was vert faint.
It was the 2nd test in the pack and a first response I think so I had no more and heard they were reliable.
I think we can drive ourselves mad, you had a positive test and no period so try and relax for now. Going through the palaver of you being told the hormones are low which they could possibly still be will further your stress. There is nothing you can really do that this point. Why don't you try and do something nice today to distract yourself, a nice walk, lunch, enjoy the sun (much nicer then blood tests and the stress that it involves sitting around waiting). Try fill your body with some happy relaxed hormones and tomorrow or the next day get another quality test to put your mind at rest.
Sending big hugs
xxxx (sorry not sure how to delete last one i did not tag you in)