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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Can Plan-B Cause Menstrual Irregularities?

Me and my girlfriend had sex about 7 days ago and the condom ripped and we were afraid about pre cum so we got plan b and she started another period when she had just fisnish her period 8 days ago I ve read about plan b causing bleeding to prevent pregnancy but I m confused why she just started another period within 2 days of her period ending I m scared about her being pregnant please help me out ?
Thu, 31 Dec 2015
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General & Family Physician,  's  Response
Hi,
I understand your query.
Plan B is high dose hormonal preparation.It acts by postponing ovulation (when it's nearing with a risk to get conceived).At the same time it has a natural action of creating withdrawal bleeding as the drug weirs off from blood.
& the withdrawal bleeding is within 8 days after taking plan B pills.
I think you had the sex within a couple of days after finishing her periods. And drug created withdrawal bleeding , which you think to be second period. Her coming period will be delayed by about 8 days ( due to plan B effect)
I don't think she has any chance of conception from the sex under consideration.
Thanks.
Thanks.
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Can Plan-B Cause Menstrual Irregularities?

Hi, I understand your query. Plan B is high dose hormonal preparation.It acts by postponing ovulation (when it s nearing with a risk to get conceived).At the same time it has a natural action of creating withdrawal bleeding as the drug weirs off from blood. & the withdrawal bleeding is within 8 days after taking plan B pills. I think you had the sex within a couple of days after finishing her periods. And drug created withdrawal bleeding , which you think to be second period. Her coming period will be delayed by about 8 days ( due to plan B effect) I don t think she has any chance of conception from the sex under consideration. Thanks. Thanks.