Moscarried last month

Vicky • 26. Engaged 💍. One boy & one girl ❤️👨‍👩‍👧‍👦
Hi all! 
I had a very very early miscarriage last month I had to be around four weeks if that. So the reason for this post is because I took a test two weeks ago and it was negative but. I just took a test my period is suppose to come on Friday and I got a positive. What are the chances it could be a false positive or is it defiantly a positive because I got several negative test and now a positive. All input is welcome. Thanks everyone