Where is hubby from and where are you going? I left for about 2 weeks while my application was in progress, before I even had my OWP, and I was allowed back in with no problem. I'm from the U.S. and that's where we went...
We just made sure to take EVERYTHING with us: Marriage certificate, Visitor's Visa (or OWP in your case), I printed out the status page from the CIC website that said that my application was in progress, proof of our address (mortgage, etc.), various forms of I.D. in addition to our passports and driver's licenses, etc...
We didn't leave anything to chance but ended up only really needing our passports and marriage certificate (when we crossed over to the U.S. due to my last name being different than his to prove his relationship to me).