Looks like you've hit a stall, Yana! This is just a sign that you're on the right track, but you might have to shock your system.
How's your cardio? If you're looking to mix it up, check out 30 Day Shred from Jillian Michaels- I've found it here on Youtube:
http://www.youtube.com/watch?v=1Pc-NizMgg8 and it's only 20 minutes of actual working out- sounds impossible to get a workout in that short of time, but believe me, you'll lose some weight in sweat alone!