Second...a plateau, a true plateau, is weeks if not MONTHS of NO movement, up or down. And the first one usually (no always) takes place at about 40-50 pounds.
Now that that is out of the way, I agree with Chickie
. Working out is awesome, but not necessary, especially there in the beginning. But, if you are doing it, keep it up. Just make sure you are nurishing your muscles within 30 minutes post workout so you don't end up with issues. I'm talking about something within the 100 calorie range, decent in protein, low in carbs. I personally like the EAS Carb AdvantEDGE shake for my psot workouts. Feeding your muscles post workout is critical in building lean muscle mass (no, this will NOT bulk you up). And lean muscle mass, as it burns the fat away, will take up some (not all) of the space that fat contained and may make you gain a few (we are talking VERY few) pounds. Then, the muscles burn the fat even faster while at rest.
When the scale stalls out, take up your tape measure. Track your lose in inches. I know it helped me when I was in a six week plateau. It was nice to see my stomach go from 55 inches to 47 inches but my scale didn't budge ONCE.
Also, if you don't have it, set up an account on MyFitnessPal or LoseIT! and track every single thing you put in your mouth. Weigh every single item and measure it properly. Chances are you are either A) not eating enough and your body is in a false sense of starvation or B) you are eating too much.
And just to throw a few encouraging facts out to you:
It takes roughly 6 weeks to form a habit but only 72 hours to trash it...meaning if you are exercising, keep it up because it only takes three days to derail and not want to go back on track. It means keep dieting, because within three days, you will derail.
It takes the average human 1 year to gain between 10-15 pounds but in the same span, the average human can lose between 1-2 pounds a week (or 52 to 104 pounds a year.) That means, if we put our minds to it, we can lose substantially faster than we gained.
You started in March. Since I don't know the day, we will say March 1st. That's 64 days or 9 weeks. You've lost an average of 1.78 pounds a week...I'd say you are right on track.
Remember...the averages is the averages of the ENTIRE time you have been dieting, not a guarantee you will lose every week. Heck, even with my 6 week stall, I am still averaging 1.4 pounds a week.
You got this. Don't derail. Have faith. It may slow and it may stall, but slow and steady wins the race.
“Don’t let the fear of the time it will take to accomplish something stand in the way of your doing it. The time will pass anyway; we might as well put that passing time to the best possible use.” ~Earl Nightingale