Um.. Help?

Im late on my period, but I don't know if I got my period or if I'm having pregnancy symptoms. I'm having slight cramps and I'm always having stomach problems and almost grew up a few times but would never happen. This morning I went to the bathroom and there was a little bit of blood but not a lot for me to know if it's my period.  My boyfriend and his family think I'm pregnant from my stomach problems but I just don't know.