Period help !!!!!!!!!!

Jenn
I'm so confused I had my period may 30th it lasted about 4 days like normal June I think I got my period on the 27th it only lasted like 2 days and the next couple days I only had light blood when I wiped and now I have two different apps one says that I'm two days late for my period and the other app says my af is due on the 27th so idk what app to go by I took a pregnancy test and came back neg so I don't really know what's going on