Have I had a chemical pregnancy?

Hey guys, so I took a pregnancy test a few days after I ovulated just for the sake of it, I really don't actually know why, I had loads and I thought, why not? So I took a test and got a faint line, the day after I took another one, and nothing, and again the day after that. Now a couple of days later, I've started bleeding lightly with mild cramps, but my period isn't due for three days. Have I had a chemical pregnancy or was the first test a dodgy result? Baring in mind all the test I took were from the same packet? Thanks in advance.