I think most schools send out invites past January as well, and I've seen people get accepted from interviews late as that. So no need to worry right now. If you don't hear back by January I would say start looking into plan B for your gap year. But so far you got 2 interviews, which is pretty good, and its still early in the cycle, as some schools begin sending out invites sometime in September. There is no need to worry. The worst case scenario is that you have 2 interviews. Some applicants would love to have your worry. And even if the absolute worst happens, that just means you start dental school 1 year after.