30 days to make a difference

I've been working with a personal trainer since Oct 2014
Driving a computer desk for the past 10 years - 12-16 hours a day really took a toll on my body. I finally made a decision that I'm not going to work my butt off only to retire and have a ton of health issues. That makes no sense.

So far, I have lost 30lbs and have trimmed 8 inches off my belly and reached my first goal. I've been very happy with the results so far and am actually enjoying a better lifestyle, but still driving the desk.

My trainer is going to be gone for the next 4 weeks so I'm on my own - this is going to be a big test for me. I have been training with her twice a week and trying to get at least 30-60 minutes of some sort of cardio and additional weight lifting on my own.

My challenge is to lose 10 pounds before she returns. I could probably easily achieve that by going on a strict low carb diet but I also don't want to sacrifice the muscle I have built so far and am not sure that would be the way to go.

I'm currently eating a mostly clean diet.
No fried foods, no added sugar, no carbs for dinner. Lots of protein, veggies, fruits, and some grains.

Current plan is to weight train 4 nights a week for around 30 minutes and then 30 minutes after for cardio. I normally do an elliptical at level 7 with 11 set as resistance (it goes to 20)

That all being said - I'd appreciate any feedback on any 30 day programs any of you have had success with. I want to have a great 30 days so we can train harder when my trainer returns.