truck driver having trouble loosing weight

In my opinion, 7 days isn't something to worry about. I've never tried this 'insanity' thing but I don't like the sound of it to be honest! Whatever your exercise though, your body is going to go through a lot of changes when you take on a new regime.
For one thing, your weight will change from day to day due to fluids in your body. Sometimes my weight goes up by a couple of pounds and then down again and I think that's normal.
Also, with a sudden increase in exercise, your going to gain muscle, which means you will gain a little weight that way. This is nothing to worry about, but is difficult to precisely predict or measure.
These are the reasons why it's not really recommended to weigh yourself every day - it's often meaningless.
Another issue is that your scales may not be accurate. Mine and also several of my friends' scales often give the same reading for days on end, and then if I remove the batteries or change them from pounds to kilos, I get a different reading!
Anyway, don't worry about 7 days. Be consistent with your diet and exercise and pretty soon your health will improve, it can hardly do anything else.

9lbs in 3 weeks is great...

Not losing for 7 days is expected actually esp with new exercise...

It will cause water retention which can last up to 2-4weeks...

Just be patient, weight loss is not linear...it will come...

and here is some perspective...it took me 3 weeks to lose 1.4 lbs...and that happened on the last day of those 3 weeks...it was my last pound imagine waiting for that to happen.....:grumble:

what helped me was avoiding the scale all together. I truly believe my unsuccessful weight loss ventures was caused by the numbers on the scale. I used to weigh myself every day...sometimes two, three, four times a day...scale would go up a pound, down two pounds, up three pounds, down a pound. It was like all my hard work of dieting was for nothing...I'd figure why even bother if I was going to gain weight anyway.

So, I decided to try weighing just once a week... at the end of week one, I was afraid to step on the scale for fear that it would say I gained, so I chose to postpone that weigh in for another week. At the end of week two, I decided to give it just one more week since week three of any diet is the make-it-break-it week for me... well, needless to say, it is now 11 months later and I've not yet stepped on the scale.

But let me tell you... my clothes say it all... the first day my too-tight jeans fell off my butt was a day I thought I'd never see... those too-tight jeans are long gone and have been replaced with jeans that are now 10 sizes smaller than the largest size I have ever worn. At 58 years old, I am guessing I weigh less than I have ever weighed in my life and very close to weighing 1/2 of my all time high... I am literally 1/2 the woman I used to be!! (or darn close to it). My grown children have NEVER seen me at this size... *I* have never seen myself at this size!

so.. my suggestion is to continue doing what you are doing...just don't weigh yourself until you feel good and ready to do so. Let your clothes be your weight loss monitor. Give it a try for a month and see what happens.