I missed my period last month. So I notice the I'm getting dark around my nipple which means that I may be pregnant. Anyway, just yesterday I had a clear slimy discharge with little blood and then later more blood and cramping. Could that mean I had a miscarriage?

Your nipples don't get dark the first month of a pregnancy... that really doesn't start to happen until at least the second trimester. The first trimester nobody that lookes at you that doesn't know you would see anything that would indicate a pregnancy. No doarkened nipples... no baby bump... none of those things classivally associated with a pregnancy.

If you actually were (did you test positive?) then your hormones will be screwed up for a while so retesting would be futile... you could have your OB/GYN do a sonagram to make sure.

You do not even know you were pregnant, there are many reasons for this, so could it be, of course, could it be hormone issue, infection or a dozen other things, yes.

So without a doctor exam no one knows