Good advice celtic. I had a lav orp egg like this, and had to help him pip, he was acting the same way your ducky is. and he hatched fine 

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Muscovy or pekin not sure which Day28 Started tryin to pip 2-3 days agoWhat if it has and you can not tell? Better to help and look at this point, than to wonder what if and then have regrets. Then again when did this egg start trying to internally pip? What day are they on, what species?
If its a Scovy then long periods of rest won't be uncommon. If its a Pekin then you need to look and see if it's in distress. Not knowing makes it a hard call.