Well you can stick with trying to lose 7 lbs a month, that is a great goal, but if you do not lose that amount don't beat yourself up, just know that its very hard to lose the same amount of every month, every once in awhile you'll have that 3 lb loss,,, or no lbs. Be happy that you did not gain, that is a great goal in itself. I wouldn't change my goal until after 2 months, if by the 2nd month I didn't make up the couple lbs I didn't lose the month before then I'd adjust my goal a few lbs.
You're doing great by the way!