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First time sex delay period ?

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My last period finished on the 31st october, I then had sex for the first time on the 3rd of november. So i was due 2 start my period on the 7th of this month as my cycle is every 5weeks. Were on the 14th and i still haven started.
sex was protected my boyfriend used a condom. im gettin al symptns of ma period like.. lower back ache, weak bladder but theres no sign of my period.
i have taken a pregncy test and its come out negative..
so does having sex for the frist time delay your period?
please help..
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replied December 14th, 2010
Welcome to ehealthforum.
Having intercourse for the first time can cause changes in your hormones leading to delayed periods. Another possibility for delayed peiods could be pregnancy (since condoms are not 100% safe and are associated with failure rates).
If you do not get your periods within 10 days of your actual expected period date, then go ahead with examination and blood HCG level test done by your gynecologist. Urine pregnancy tests can keep showing false negative test results due to less concentration of pregnancy hormone (HCG) in urine, and hence cannot be relied upon.
Take care.

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replied May 25th, 2013
pls my girl friend was to have her period on 17th or 23rd,so we had sex on 17 which was her first sexual intercourse,and i did not cum inside her,but am so worried.
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