Been on bc for about a year. forgot to take pill 1 night had sex w/o condom, not sure if he came in me. took plan b next morning. spotting now?

Plan C?: if you 'miss' a pill, take it as soon as you remember; take the next pill at the regular time. If you don't notice until its time for the next-days pills, take two. You are still protected if you follow these instructions and don't have to take plan b. However, since you took plan-b, you are still protected but will have spotting and possibly a delayed period. Best wishes!