Hello, and I hope I can help you today.
First of all, it is extremely uncommon to be fertile during your menstrual cycle. The
hormonal drop the causes you to get your monthly period is inconsistent with ovulation, so unless you have very short menstrual cycles (less than 23 days) it is unlikely the you would actually have ovulated during your period.
The morning after pill is extremely effective in preventing
pregnancy if taken within the first 72 hours after an unprotected encounter. The morning-after pill works by thickening the mucus of the
cervix and
uterus to help to prevent fertilization. If the medication works, it usually triggers a small amount of bleeding like a period 3-7 days later. Therefore, the fact that you already have bleeding is a sign that the medication worked and that you did not conceive.
Pregnancy symptoms vary widely between women, and many of the symptoms we commonly associate with pregnancy such as
nausea, appetite changes,
bloating,
abdominal pain, mood changes and breast tenderness can occur as side effects of taking hormones or of an irregular menstrual cycle as well as pregnancy.
Therefore, there really is no reason to worry at this point that you are pregnant. Is normal to have your period be late after you've taken the morning-after pill, as you already had some bleeding this cycle, however taking a pregnancy test at that time (when you are late) would not be unreasonable. If that test is negative, then you can be re-sure that you are not pregnant and do not need to retest even if that menstrual cycle comes late.
I hope I was able to adequately answer your question today, and that this information was reassuring.
Best wishes,
Dr. Brown