Possibly pregnant

I was suppose to start February 14 and all i got some was light spotting for two days, after that there was nothing, which I knew was VERY odd for me because my period is regular and I have a very heavy flow, and I have been off birth control for several years now hoping to conceive but no luck. So by February 18, I took another digital pregnancy test and still nothing and still no sign on my period or anymore spotting. So now I am eight days late and I’m so nervous to take another test because I want it to bad to be positive. What do you ladies think this could be?