You think I’m good?

My boyfriend and I have been TTC since we started dating 4 years ago. We’ve had so much unprotected sex that it’s weird it hasn’t happened yet... I’ve had this app for years and I always chart my periods and ovulation dates, but for some reason my period this month was 9 days late. I got it but it’s light, and I didn’t feel it coming. There’s no extra stress in my life, actually there’s way less then there used to be.. Is there a chance that I could be pregnant even though I got my period late? I need answers!! And baby prayers!!