Can I change my Invisalign aligners if they are still tight after two weeks?

I'm on my first tray of Invisalign. My top aligners have been loose since the end of the first week. After 10 days, my bottom aligners are very loose on the side (the bottom even bend easily when I try to put them too fast, and then I have to bend them back to original form), but the front teeth still feel very tight when I put them on. Can I still switch to tray two in 4 days without risking messing with my whole treatment?