Pregnant at 15?

I’ll say in advance that this is a messy situation, so if you’re going to pass judgement in the comments, stop reading. My ex-boyfriend and I had been having sex a few times a week for the past two months, but have always used protection and even took care not to have penetrative sex when Glow said I was ovulating. However, I’m now 3 days late for my period. It could be stress-related because my mental health has been awful lately but I’m just worried. Do you think there’s any way I could be pregnant? The times we’ve had sex, we’ve checked the condoms for leaks. And like I said, we don’t have sex during my fertile window but Glow could have miscalculated or my cycle could be off. I’m worried because if I am pregnant, there’s no way I could raise a child. My ex-boyfriend would obviously not step up.

EDIT: My usual cycle length is 32 days. I had sex on day 8 of my cycle and am now on day 35 of my cycle.