weird, losing alot, then gaining back

Ok, so I try to go for losing 3 lbs a week, which is more then the reccomended amount usually, so I wake up two days ago and lose a pound. Then I wake up yesterday nd have lost 2 more lbs so thats 3 already with 3 days to go in the week still. Then today i wake up and have gained 3 pounds....whats up with that??
 
Is that neccesarily a bad thing? Could it be water? Could i have put the water weight back on that I lost?
 
Im lost at this point. Althougth i have lost much more then the reccomended poundage weekly, i have no idea whats going on honestly.
 
HELLLLPPP.
 
p.s. i have a cutting log in the online training journal section

dont wiegh urself every day just once a week, and r u doing it at the same time every day?

yeah, im back to normal...i think i ate bad and at late at night so mighta screwed me up.