My period was due today but didn't come, i had sex yesterday and spotted after. could this mean im pregnant?

It Depends: Anytime you have unprotected sex without protection (condom) and/or not use birth Control (IUD, Pills) then there is a chance that you could be pregnant. I would advise you take a pregnancy test about 7 days after your suppose to have a period. So in your case you Feb 22nd. But I suspect you are not pregnant because u had sex about the same time as your period, and the egg is usually gone by then.