- did not have sex, but some semen may have gotten on or near vagina
-took plan b pill 12 hours later (22nd november)
-got period on the 27ht november
-real' period is due 14th december but it hasn't come yet
- lower abdomen discomfort - a little like a stomach virus?
- has had 4 negative pregnancy tests to date

are there any chances i'm pregnant?
If i got my 'period after taking the plan b pill, does this mean my cycles has changed?