Increased libido!!

Rebecca
Been TTC for 6 months, but only had regular cycles the past 2 months as took a while to get back to normal afte stopping the pill. 
I am just out of my fertile window and BD'd twice in that time, but today my sex drive has completely gone thru the roof and that is very unusual for me. It's all I am thinking about! Am I maybe still approaching ovulation, even though my charts and CM say I'm no longer fertile, or can increased libido be a sign of preg?