Pregnant?

I was 7 days late and then started my period, I had awful cramps and I felt like a wave of emotions were taking over me. I was driving and I had to pull over because I couldn't handle it. But it only lasted an hour.. I woke up this morning with little to no bleeding. I've taken two pregnancy tests on the 6th and 7th late day and both came up negative. It's been awhile since I have had sex. I'm just worried If anyone has experienced this, I would greatly appreciate some help/advise.