I had sex 2 and a half weeks ago and haven't been taking the pill properly since then. I stopped the pill 4 days ago and had sex the day I stopped it, now 4 days later I'm getting brown spotting and I heard sperm can stay in your body for 5 days. Am I pregnant?

The only way you'll be sure is to do a home pregnancy test. Normally, not having a period is a strong indicator that you are, but coming off the pill will mess with your normal cycle. Buy a home test and find out.