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The post coital oral contraceptive pills
have efficacy more than 95% in the first 24 hours after having sex. You have taken it during the first 24 hours which mimic the chances of getting pregnant.
Regarding your symptoms, These post coital oral contraceptive pills have side effects of nausea and abdominal pain
. A condition in which there is occurance of conception and after the using the post contraceptive pills with the most effective time period as you have taken. There is forceful expulsion of the embryo and the cycles may occur even a week or two weeks before the suspected dates. All this process is induced one and forceful which exaggerates the workload on ovaries and uterus endometrium to shed before its actual time. The whole process creates severe pelvic cramps
. You can use mefnamic acid or ibuprofen
in such pains.
If you are still suspicious that you might be pregnant, then you can have a urine pregnancy
test once two weeks have been completed of you sexual intercourse that is 18th April but if you want to confirm it earlier then you can for beta HCG levels.