Don't assume that "all will be fine" - research suggests that where you have hard/lumpy injection sites the insulin won't be absorbed properly. This is further exacerbated by the fact that if you then in turn exercise that area (so say you have lumpy injection sites in your legs and then do some squats) you can accidentally "release" insulin that has been building up there because it can't be absorbed.
Anyway, the best thing to do is to keep trying to rotate as much as possible and really keep an eye on this. Even when I think I'm rotating a lot, I unconsciously tend to re-visit the same or similar sites again and again - for example, think if you are left or right handed and whether one particular side of your stomach is favoured.
Other than thighs you can consider your buttocks or hips (if you have enough fat there). Alterntatively, just keep a really accurate note (or memory) of where you have injected previously so that you are sure you're rotating enough.
Good luck!
LJ