If you plant earlies, something might happen (frost permitting) but maincrop tuber formin is triggered by the change in daylength at midsummer, so you won't get them early and just have the chance of lossing them to frost
I'm not certain about 2nd earlies.
If possible don't plant your own saved seed, the chances of propaating disease is too high. Things like eelworm are not visible but planting tuibers with them in will infect your ground. Certified seed is relatively cheap when you consider the cost of the tubers each seed tuber will produce and you will not spread diseases on your own ground or for spreading by aphids etc to others, including farmers whose business could be at risk
Phil
Phil