Need advise

😙👄👪 • Trying to convince with my partner for 2 years now! Hopefully get good news soon!!

so guys I need some advise! my last period was on the 6th June. I was suppose to come on 4th July but not had it.. so I am 15 days late.. done a test and came back negative.. I'm worried as I'm normally on time each month or just a couple of days late! can anyone advise?