thanks for your query.
Taking oral contraceptives pills for 10 days after unprotected intercourse
is no known method of contraception
You should either take emergency contraceptive pills within 24 hours, or switchover to a reliable, permanent method of contraception.
As your pregnancy
test is negative, you need to consult a gynecologist to rule out cause of missed period.
It might range from erratic intake of pills, to stress, to hormonal
disorders or some other uterine cause.