Stopping birth control mid pack will reduce the effective of the contraception. Oral contraceptive do not interfere with the pregnancy tests. The better option would be to do a home pregnancy test if you are concerned that you may be pregnant. If the test is negative, you may stop taking the pill. If you are pregnant, a normal withdrawal bleed will not occur and you may then need a blood test to confirm pregnancy. If you do not wish to become pregnant I would advise that you resume taking the pills if you are not pregnant and use back up contraception (condoms) for a week.
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