What is considered late?

I’m on Notrel 1/35. I normally take it at 10pm every night. Is taking it an hour or two late considered missed or is it okay? I continued the next pills at 10pm for the rest of the nights like I normally do. I had unprotected this month and just want to make sure I’m safe. I’m feeling bloated and have heart burn(which could honestly be from a variety of reasons). I will wait until I start my reminder pills to see if there’s anything to worry about.