So my last period was November 15th to 20th. I am currently 16 days late than what this app predicted. My periods range from 23 days to 51 days apart but normally in the 30s. My boobs are super sore like normal, im moody and feel like i need to pee more which i also have sometimes before i start my period. I have taken four test all of which say negative. The longest i have ever been late that i remember is 18 days and i have been tracking for over 2 years. My husband and I use the pull out only. Do i just wait or what? Oh also on Christmas day when i wiped there was a little blood but it went away.