Congratulations hun! That's great news

Could be either as far as dates go. Was your last period much lighter than usual? If so maybe you conceived the cycle before and had a light implantation bleed you assumed was your period? Or you could have ovulated this month earlier than average and conceived then rather than the average day 14 or so. Therefor you would already be able to detect the hormone needed to give a positive result on the pregnancy test? Either way it is great news and as has already been said you will be able to get a definite answer at your dating scan hun! xx