Should I worry or is it normal ??

So I've been in the pill for almost 2 full moths. Two weeks ago I was spotting and I thought it was normal but it also worried me a little and made me think I was pregnant for a second. I was supposed to get my period two days ago and nothing yet. I took a pregnancy test and i think it's negative but the little square thing next to be big one kinda of made me doubt it. 
Has anyone experienced this??