Baby's test faint line?

[yayboostered]

I no I'm seeing things as my son10 and daughter 12 are positive son tested positive this morning so I thought I would test my 1 year old she has a little cough and keeps choking on snot. Obviously I didn't stick it up her nose to far as i was so scared and this is the result after 15 mins

I can’t see a line on the photo but a faint line is a positive.

I can normally see even the faintest lines but not sure about this. I'd keep baby home and retest in a couple of days.

My 2 year old just tested positive now