I feel like Im loosing my mind

Hi Ladies!!  I am new here and I am freaking out.  My ds is 11 my dd is 9 and I had a tubal ligation done when I had dd.  I am 38 married and have been feeling TIRED!!!! sick, sensitive ets all the normal stuff,  I decided that I needed to just double check and make sure that I was not being a goober.  My cycles are typically all over the board between 21 and 35 days apart.  my last one was 15 days ago.  However, I took 4 test between yesterday and today and I have 4 positives.  I keep trying to find something that says that maybe they are wrong but I have not been successful.  I know odd things like this happen but seriously any one know how it may be positive?  HELP