FYI -
According to the American Pregnancy Association - Chemical pregnancies may account for 50-75% of all miscarriages. This occurs when a pregnancy is lost shortly
after implantation, resulting in bleeding that occurs around the time of her expected period.
Also -
An over the counter HPT (as opposed to this supposed test in labs) CANNOT detect HCG before implantation.
According to
www.peeonastick.com - When an egg is fertilized, it takes about 6 to 12 days to implant in the uterus, and then it begins to secrete hCG. It takes another day or two for enough hCG to build up and make its way into your pee. So, generally speaking, the earliest you can expect a positive HPT is 8 days past ovulation ("DPO") and the latest would be about 16 DPO. It is possible to get a positive test earlier or later, but not as common.
FYI
A chemical pregnancy occurs when a fertilized egg does not implant into the uterine wall. If a pregnancy test is taken just at the right time it will be positive, however, when a repeat test is taken several days later it will be negative.
Chemical pregnancies also more recently covers extremly early misscariages ie within a day or two of implantation.
So chemical pregnancies covers both, anything that can only be picked up by chemical testing ie hormone strips and blood tests but cant yet be detected by ultra sound (it then becomes a clinical pregnancy)
https://www.ourmiscarriage.com/chemical_pregnancy.html
https://www.womens-health.co.uk/chemical.html
https://miscarriage.about.com/od/miscarriageglossary/g/chemicalpreg.htm
https://www.chemicalpregnancy.org/
HCG is produced on fertalisation but is increased massivly once implantation happens hence why most tests cant pick it up till a few days after implantation but its possible to pick it up before implantation.
At the time of my chemical and my following pregnancy I was undergoing strict observations so I knew the time of ov, the time of conception so I knew how many dpo I was when I had my chemical and my following pregnancy
