Mom supposedly catched covid from me. she didnt have contact with anyone else. she is recovered after 13 days, but my test came out negative yesterday. how did she got covid if i dont have it? why she didnt pass it to me? i dontuse mask with her?

Many of those catching COVID-19 infection or symptomatic disease never know the source. Victims can carry the virus to others but they either don't have any symptoms or mild ones.

Many cases remain unclear of how the transmission took place. In your case, you tested late if you were the source and did not have symptoms at the time. You could have been tested positive 2 weeks prior and eventually cleared by the time you tested.