Spotting 13 weeks pregnantt

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I have just started spotting when I wipe… it’s got a tinge of brown to it. So I’m alittle worried, I’m just 13 weeks pregnant today.

So I would like to know if anyone has had this happen and if it’s normal?

I have not had sex or an exam recently, 

And I did listen on my Doppler, and I heard the heartbeat which is strong still!