If you've had a classical incision, then typically they don't want you to labor... however, I think you'd know if you had one. Did your doc that inserted your IUD do your surgery? Really these days it's rare to do a classical incision unless they need to get in as fast as possible.
Also - was this your first C section? If you've had more than 1 most providers will want to do a repeat C.
I'm guessing that it's an error on your chart, but I would double/triple check with your provider if you decide to have another. Just so you know, my birth with my DD had similar features - had to use a vacuum - it popped off once so they had to use it again and they had to lengthen in the incision to get her out. Her 1st apgar was 8, though. So, all this to say that I don't think that's the type of situation that would cause need for a classical incision.
G/L in whatever you decide to do with your next birth!
If interested in a VBAC, you should come over to the VBAC board! http://messageboards.ivillage.com/n/mb/listsf.asp?webtag=iv-ppvbac&nav=start
Meanwhile, get records from the hospital as well as from the dr (they may differ!) My records also said classical scar and my outside scar is vertical (no bikini cut for me!) So I believed them. I was also told I had a septum greater then 2/3s! But then when I had my second c-section I found out that I did NOT have a septum (just slightly heartshaped) and that the incision was not classical but low transverse.
Something that is possible is that they did a T on you. If they got in and found a problem (sch as excess scar tissue or the lie of the baby) they may have done a low classical or T inscription.
If you do indeed have a classical, it doesn't mean you can't have a VBAC but it does mean that it's unlikely to find a provider. Your chances of rupture increase. But if it is classical there's a good chance it's a low classical which improves the possibility of a successful VBAC.
I wish you all the best. I'm planning my first VBA4C and will deliver any day!