exercise

im trying to figure out if im exercising too much which sounds kind of odd. i have a lot of weight to lose and first week i lost 6 pounds which is mostly water im sure. my weigh ins are wednesdays and thursdays are the start of my week. beginning to mid of my 2nd week i went out of town and weighed in last wednesday and gained a pound. i then weighed today and no change. i have my settings to 1 1/2 pound loss, it was 2. i workout everyday, in the last 18 days i took 1 day off. i either do 50-60 minute mod pace walk or 50-60 min high impact or general aerobics. today i was light headed and flustered on top of not much sleep and only got 25 minutes in. anywho am i gaining major muscle from cardio workouts? lol i know i shouldnt expect to see too much of a difference but atleast a pound loss every 3-4 days. i drink beer, and do not go over my calories, although im taking a break from it leading to weigh in to see if thats the issue. my net calories have been somewhat below 1200 the past few days but i allow this for mfp error when logging. its too early to hit a pleteau and i have so much to lose