A few days later after my period was over i had unprotected and my boyfriend finished inside of me. The next day i went out to get the plan b and a week later i got my period again!!!!

i was wondering if this is normal???
and if this is now my regular period or should i be waiting for it again at the time that i was supposed to be getting it this month????

and one last thing, by getting your period a week after taking the plan b, and having some breast tenderness, am i safe from pregnancy????

I would appreciate a response as soon as possible. thanks.