lost 15 lbs but today is different

northernnative33

well i lost 15lbs..i notice the difference....really. I see curves...my clothes were loose and i was able to fit my wintercoat.
My legs are hard from walking.
Well today i notice my midsection is huge...again...i still wiegh the same but i cant button up my winter coat...it pops out. my gutt pops out more...my tummy looks like what it was 2 months ago....im on highblood pressure pills...so its a water pill..so i should be not carrying water right? what is it?