I had unprotected sex I've been on birth control pill for over a year never missed a day andy period starts in 10 days what are the chances of me getting pregnant I'm only 15 and scared

Yes, there's always a chance, no matter how remote, but you have to wait for your next cycle.

But is it a big chance? I haven't missed a day and I've been on it for over a year

No form of birth control is 100%, there are people on this site, and people I know in real life, that got pregnant (not pregnant) using the pill, a condom, and an additional form of birth control. Some got pregnant more than once with all those forms of birth control.

If you're having sex, that means you're ready to be a parent, since no form of birth control will protect you from pregnancy 100%.

Are you ready to be a mom at 15?

So yes, there is a chance. There's always a chance any time you have sex.

Agree, no form of birth control is 100 percent. There is no way to say 10 percent, or 50 percent. You either are, or you are not. You just have to wait