Bleeding but still pregnant?

Has anyone here ever experienced something like a "period" even while you were early in a pregnancy? 
I've been having relatively irregular bleeding for the last 2 months. Neither has been all that heavy, and both have been either early or late compared to when my period should have showed up.
I took a test today and it was INVALID or something. So I'm kind of freaking out. 😳😖

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