Depo Provera Help!! (Messed up on the last one)

I started my period on the ninth this month, so I called my doctor to get my 4th depo shot early on the 12th. I've never been late or missed any of my shots.. Well, my boyfriend and I had sex on the 18th and he came in me.. I'm making myself paranoid thinking about it so much, but Should I be worried at all..? Please help!

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