Please help me understand my cycle

I've been patiently waiting for AF. I was supposed to get her on 1/31. But since I didn't start it on 1/31, Glow pushed my period start date to today 2/2, i edited the app today and saying aunt flow didn't start today, and now it's saying it will start 2/4.It's about 11pm here and still don't have aunt flow. the times I used the bathroom today, when I wipe, its pale pale pale pink or brown. Crampy and cranky. We used pullout method on 1/19 &. 1/20. Is there a chance of pregnancy?