unsure?!

My period was due on the end of January/beginning of Feb, I was 6 days late, I took a pregnancy test and it came back negative, I had 2 days of bleeding the next morning and that was it.  My cycles are quite long so my next period isn't due for another 2 weeks. However this last week I've been really bloated and uncomfortable. and very moody, and had pains in my back? Should I wait to see if my period is late? Or what? I'm so confused?? Please help??