Help!!

The last few days I haven't been feeling quite myself.  I've been extremly bloated...to the point where I can't really eat.  I get full after a few bites, very thirsty, and having leg cramps.  Oh, and my last period came as expected, but was very short and very light. I just took a digital hpt, just wanting to rule that out, but instead it said yes+!!  Has anyone ever heard of them being false positives with digitals.  I didn't use fmu either.  I'm incredibly happy, just shocked!