HELP Bowel movements

My baby is 2 weeks + 1 day old and we are on day 3 without pooing. She is breastfed and was pooing twice a day previously. Today I have woken and fed her every 2 hours to make sure she is feeding enough. She is weeing normally and changing 8-10 wet nappies a day but no poo. She is content still and sleeping well. What can I do ? Do I need to be worried (well I already am) ?