Beginning AGAIN

Mike and I have begun P90X once again.  We've been going strong for a few weeks now. I have lost 10 pounds again this time.  However, after we quit the first time I had gained about 20 back, so now I'm back to my start weight before I began P90X the first time.  I have so much work ahead of me.  I must keep going though; I have a bridesmaid dress I must fit into for a wedding this October (next month already!!).