if you have sex a day after the period is over then nothin to worry. becoz according to the docs rule of thumb it is from 9th day to 18th day after the mens. period one should be careful while having an intercourse if you are not trying to become pregnant.
Hi!
Unless you are "trying", I would be nervous. You may want to consider calling your MD for Plan B--you can take that for up to 72 hours "after the fact". (That is what is known as the morning after pill, and can prevent pregnancy>)
While your on the line, check with them about getting on something for next time too!
Good luck!
Dr B