This is my first year with duck eggs. Friday was day 28. I began to see some eggs rolling at around 4pm, but as of today, Sunday at 9pm, no pipping. I can hear cheeping from at least one egg. Should I be worried that there is no pipping? The temperature is around 99, but I don't know what the humidity is. My incubator does not monitor the humidity. Thanks for any advice you can give.