AF DUE 4/1 5/1 and 13/1 so confused

Natalie
I use three different apps and for some reason they are all giving me different dates.
I have had sex for the past three days intermittently and bled the last two times but it wasn't a lot of blood on the first day then stopped after I cleaned myself up.. Had sex today and again bled after I'm concerned 
Help anyone?