@jsgirl,
Hi jsgirl.
Are you "wanting" to get pregnant? If not, why are you playing Russian Roulette..
It only takes one little bugger and that's it....and they can swim....
I personally would think you are lucky and chances are you are not, but that doesn't mean that women don't spot instead of having a period and can be pregnant.
Wait a couple of weeks and get a pregnancy test.
Is there a reason if you do not want to get pregnant, why you are not practising safe sex on all accounts....