He'll come out. Just make sure the fluid in the egg stays clean. If it starts looking off kr getting smell then you have another problem. People that cut often have babies in the egg for over 5 days depending on when they cut. So 3 isn't bad. As long as he looks good and you don't see any threatening issues he'll come out in his own. Just keep and eye on the fluid. It builds bacteria after awhile easily. A good flushing may be in order.
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