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Firstly before taking any more pills you need to confirm if it is pregnancy
because having sex after ovulation in high chance for getting pregnant. If pregnancy is present by the test, you can choose weather to keep or terminate the pregnancy. Either way you need to consult the Gynaecologist. If you are pregnant the mild bleeding could be either normal implantation
bleeding or could also be a miscarriage
since you feel sharp pain
and light headedness. You will need to confirm if the pregnancy is ectopic, if you are pregnant which can be very dangerous if not treated early. If you are not pregnant it could mean that you probably have a vaginal infection
, hormonal disorder which is causing this problem for which the Gynaecologist will give you something to help you. Do not delay. Get the pregnancy test done immediately and go to the Gynaecologist Office.