snowJT said:
I don't know where else to ask something like this, but a friend of mine had her period and lasted a day and a half.. and is worried that she could be pregnant... but that's not possible if her eggs dropped because she started her period right?
As Evo mentioned, it IS possible to have a light/short period when pregnant, especially if there is not yet enough hCG being produced by the conceptus to completely block that bleeding. If that is the case, it is also possible that a home pregnancy test will not be sensitive enough to detect the pregnancy, so she should make an appointment with her doctor for a blood test.
It is also possible she WAS pregnant, and implantation failed, though that typically results in heavier bleeding. Even if that happened, it will be important for her to get an exam to make sure everything that should have been expelled was.
There can be a lot of other reasons for a short period or mis-timed one, most of which are nothing to worry about (again, as Evo mentioned, being under a lot of stress is the most common of them).
In any case, if there is any chance at all that she could be pregnant, she should see her OB/GYN right away. If she had abstained during the entire previous month or so, I'd suggest she just wait a cycle and see if she's normal again before getting worried about what could be nothing. Also, if this is a pregnancy she wants/plans to keep, or is even somewhat undecided about what she will do (this is very often the case for an unplanned pregnancy), she should assume for now that she is pregnant and treat herself accordingly...no alcohol, no drugs (not even over-the-counter medicines until she has clearance from a doctor to take them), no smoking, and she should take a folic acid supplement (it's a vitamin important for neural development and deficient in many women's diets...taking this will help prevent a very serious birth defect).