You could take the morning after pill if you REALLY don't want to get pregnant; to be extra safe. It won't harm you. Most likely, you weren't ovulating around the time you had unprotected sex but it isn't impossible.
Oops sorry...I just re read your post....
about the morning after pill...sorry..LOL
Got your dates mixed up.
Im guessing too that if your cycles are eevry 28 days...u should be fine....but weirder things have happened.
Re the ovulating thing...my dr did say it is possible to ovulate more than once a month...
But if your cycles a pretty normal...I guess you should be fine.
I don't think you are ever safe.
My dr. was telling me that she has heard of women ovulating up to 2-3 times a month.
Not to mention that any unsafe sex is not safe.
I could be wrong...but isn't the morning after pill used...The morning after?
I'm not sure if you could still use it 2-3 weeks later.
Sorry...I know...not much help.