Could my period be trying to start again?

I'm currently 4 months PP. I mostly breast feed, but have to supplement formula occasionally if I do not pump enough while at work. The past week and a half I have had intense cramping. One day I had a very small streak of blood in my discharge, which made me think it was my period starting again. However, I haven't had any blood since. Today my lower back hurt badly to the point where is was hurting to walk around.

I'm just wondering if anyone has felt this much pain with their period starting up, or is it something else? Should I contact my OBGYN?

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