fmu positive but negative afternoon test?

lexia

is it possible to get a positive with fmu and a negative later in the day and still be pregnant? i got a positive this morning at around 10. i’ve drank about 2 bottles of water since then and i took some tests abs their negative. i’m confused i was so excited. the fist pic is fmu second pics are from around 2 hours later

this is fmu

this is around 2 hours later