4 days late

Danielle
Trying to conceiving for 8 months , my cycle is always 27 day's. My period was due 3/27 , ovulation was 3/15 according to the app. Still no AF , had some pink mucous slight cramping a few times , boobs were sore 1 day after missing AF , they are usually sore right before ... Not sure what to think .anyone else in the same boat ?