PATCH QUESTION

Okay so I've been on the patch for over a year now, never missed a patch or been late. Until 2 days ago because we just moved and since I'm physically disabled, I couldn't move the boxes to get to it until my boyfriend got home the next day so it was about 24 hours late (I didn't take off the old one until I switched it). Last night we had sex and my boyfriend came in me, what are the chances of me getting pregnant? I'm not looking for exacts, just high/mid/low. Should I be worried or will we probably be okay? My bc is the only protection we use and we're aware there's a slight risk but we've already covered our bases on "what would happen if" so that isn't the concern. I just want to know if chances are high and I should know this is a possibility or if I'm probably okay?