It'll be fine!
My Blues band has a decent PA, so my little combo is more than adequate for our gigs, even the big ones. I run through the PA 100 percent of the time and only turn my amp up to 2 or 3, just enough for me and my drummer to get the goods, the rest of the band has monitors.
Some of our regular "big events" like festivals and such have huge (to me anyway, it's all relative) soundsystems and my little combo is then just a glorified DI.
So relax, enjoy your gig, you're doing it right.
Clubs: LGBT #39, Blues Bassist #5, Official Fender Precision #95, Acoustic Bass Fetish #100, Peavey Amps #50, Ampeg Fam' Reunion #1004, Virginia Bassist #127, Reggae Bassist club