Chemical pregnancy?

I had a miscarriage in August and just found out I am pregnant last Friday 6/12 which is the top test I just took another test today Wednesday 11/12 and the line has gone very faint. Has anyone had this happen and it continued to be a successful pregnancy or is it probably going to result in a chemical pregnancy?

Date of conception from my Oura ring says 24/11 which makes me 4 weeks 3 days due 17th August