AM I OVERREACTING ? UGH, CONFUSED?

[Harold]

So me n this girl have been talkin on fb about few weeks ago ..(we go to seperate school) and well we was talkin about how we r both single and want to find the right one and well pretty much like what we like and dont like and well i inbox her on friday at 3:30 and on facebook it said seen on friday at 6:15 and well sunday and saterday she didnt respond so i sent her another msg sayin "hey u there " and well i got on fb right now and it said she was "active 36min ago" but it doesnt say she saw the msg i sent on sunday .. But anyways my question is .. Should i be concern !? Or am i to worried ..!? Why would she get on but not respond u knw ..!? I check her timeline and she hasnt updated her status since friday ..