Congratulations! I am no expert but I am quite sure that a m/c can occur at anytime. From what I understand it is a lot more common during the first 12wks (hence why most people wait 12wks) but my DH and I told everyone at 6wks coz we were so excited!
How far are you now?? My Dr asked the same questions and so did my widwife at my first hospital appointment. I think it is very normal to have these concerns, I was very stressed out for a while but all turned out to be ok.
Try not to stress (easier said than done, I know!)
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