Hi ladies! I'm wondering... if I'm not able to use FMU how long should I hold my urine before poas? Is it 4 hours? I am on day 155 today (last period was June 28th) and at 1:30am (here we get the strangest times for tests like that!) I will be having an MRI done on my knee. I just thought of it now, that perhaps I should do a hpt beforehand as I know they will ask if it's possible I'm pregnant. I personally doubt VERY much that I am, but I suppose it's always a possibility. And, what is a good brand of hpt to use? I know blue dye is out, and I was having some issues with faint lines on FRER. So I'm at a loss as to what test to use now.