Of course you could of had a tear in your vagina the way they said, but most likely it was your period. Your period is definitely affected by sex. Google "My period was late after I had sex" and you'll see millions of girls with the same question. So, if you had sex anytime within a week or so of when your period was actually due, it could/most likely would of been your period sped up. I've had sex 5 days before my period was due then had my period come the next day. If you have sex anytime, even during your period (gross but some people do it) then your period can be cut short - even if your boyfriend just fingers you, same thing can happen.
Your body reacts to Everything you do to it, so just be aware. The only time you have to worry is if there is bleeding an abnormal amount or if there is blood in your urine. Otherwise, you are (likely) completely healthy in that department <3 [ gr8fruit's advice column | Ask gr8fruit A Question ]
rainhorse68 answered Sunday September 23 2012, 10:23 am: Not a doctor, but I've got one in the family so I asked him. The menstrual-cycle is NOT affected in any way by having sex. Are we looking at a period or vaginal bleeding then? The 'hot sex' is looking most likely, maybe causing a tear or rip in the vagina. It's quite robust but you can over-do it! Chlamydia could be the cause (of bleeding, it can't make a period come when it isn't due either) but don't assume the worst. It's just about impossible to diagnose yourself as symptoms are varied (or non-existent!). A test is the only way to determine whether you have it or not. But it's a very far from uncommon infection and easily treated, so don't get stressed. I should pop along to your doctor and have him/her take a look. By 'unexpectedly' I assume your period wasn't due/overdue at the time you had sex, or of course you would have noticed at the time? There are other (much rarer) possibilities but a trip to the doctor will sort it all out. Best not to take chances with your body, it's the only one you'll get! [ rainhorse68's advice column | Ask rainhorse68 A Question ]
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.