Late period

So I've recorded 2 of my period on glow so far. Last month glows prediction of my period start day was correct but this month it said I was suppose to start 2 days ago and still no sign of my period. Me and my boyfriend had sex about 6 days ago but we used a condom and he pulled out. I've been freaking out and I just wanted to know if y'all have had late periods according to glow and do y'all think I'm pregant? I haven't had any signs of pregnancy.