Possible miscarriage

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Hello this has been playing on my mind a lot I had quiet a few symptoms on pregnancy a missed period, throwing up and the rest so I did a test the first one came back positive I did a couple more which came back negative I then missed another of my period so I did another test which came back negative I then got really bad cramps the following month and a heavy period with clotting could it have been a possible miscarriage or am I being silly?