Glow App Calendar

Has anyone else noticed a huge change in their ovulation period on the calendar? My period has been pretty regular since starting this APP over a year ago- typically AF begins on the 10th. My ovulation week used to be the last week of the month but now it has moved an entire week up. So I tried to stay on the old ovulation week and had intercourse on the 30th. Now Im having some bleeding early... but again, my period isnt suppose to start until the 10th but this bleeding began on the 3rd... any advice? Suggestions? Possible pregnancy? Has anyone else had the calendar make a huge change to their ovulation week like mine? TIA