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After switching birth control am I vulnerable?

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so I'm 17 years old and in September I started taking mononessa birth control. On December 4th, I started my period and the Sunday after(December 8th) I switched to loestrin/ microgestin 1/20. I take it at 6 every night and have never missed a pill. December 11 I had sex. So right away he like rubbed his penis on me, it didn't go in tho, then right after I gave him head, I was on top, and on it, but it did not go in, it was just on my vagina, and then I got off and we stopped. And I'm just wondering about pre cum? We used a condom when we had sex, and it was fine- it didn't break or come off or anything. but honestly how effective are condoms? Can any cum come out somehow and get in me. Is it true after you switch birth control brands, you have to wait seven days before they become effective? there was no break in between switching-I took the first pill of the new one the day after the last inactive pill of the ok one. Should I be worried about pregnancy?

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replied December 19th, 2013
Birth Control Answer A45438
Welcome to ehealthforum,
Since you are not protected during switchover of birth control pills, you can be at risk for pregnancy (especially if the hormonal content and dosages were not the same). Continue to take the rest of the pills and avoid further unprotected sexual contact. Look out for development of any other new symptoms. Wait and watch for your usual/next periods. If periods do not start within 10 days of expected period dates (or within 7 days of taking last active pill), or if you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be regular with birth control use, and use back-up protection while having intercourse if worried about pregnancy. Stop the use of hormonal contraceptive if pregnancy is suspected, or if pregnancy gets confirmed.
Take care.

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