No, you don't start over.
But get any cover off ASAP and get them off a heat mat ASAP if you're using one, and get them under the lights with the top of the foliage no more than two inches from the lights.
This should be done when you see th absolute first ones have germinated. They will continue to germinate under the lights.
Germination conditions that are used by different folks vary widely and it's not surprising at all to see such rapid germination, especially if the seeds are fresh and haven't been sowed too deeply.
So you don't have a disaster at all, you're just on the way to some nice seedlings.
Finally, There can be slight differences in germination time for some varieties, but not much. Craig has said that Mexico Midget lags behind for him and for me it's the variety Mirabell, a cherry sized yellow that lags behind. And it really isn't lagging at all but, rather, the genetic nature of such varieties to germinate when they do.