My last period was feb 7, n ended feb 13 i still haven't received my period how many weeks i'm i?

Take pregnancy test: First take a home pregnancy test. They're inexpensive & readily available at most grocery & drug stores. Periods/menses are notorious for being irregular so just b/c you're late doesn't mean you're pregnant. So take a test first. If you are pregnant (congrats!) then use any of several online calculators like http://www.Baby2see.Com/trimester_calculator.Html which states you're 7wks along.