Faint positives a week ago now negatives :(

Not TTC but had a surprise a week ago. 2 faint but definitely pink positives. Breastfeeding my 11 month old and haven’t had a period since before getting pregnant with him. Now tests have turned negative but no sign of any cramping or bleeding - could breastfeeding be affecting my results? Maybe they were false positives or a chemical but no bleeding .. feeling sad :(