Is it too early to take a rite aid at home pregnancy test? as of today my period is three days late

No, not at all.: A pregnancy test may be (+) test as early as 7-10 days after the fertile period (mid cycle). You're still very young. If you're having sex but don't want to get pregnant, you should consider a very reliable form of contraception such as an IUD or contraceptive implant. You don't need parental consent to do this, just a phone call to Planned Parenthood or your personal doctor. Best wishes.