Glow question I guess.

Well I started my period last month on the 10th. And glow is saying I'm supposed to start this month on the 15th.

Well its the 12th so am I technically late then? Because I did have cramps a couple days ago but nothing really anymore. And I did have sex today and bleed the slightest bit then it stopped. When I say the slightest bit I mean I wiped after peeing and then nothing.

Idk I'm just really confused...