Please read...COULD I BE PREGNANT?

I missed my period in June, got a period in July (on day 40). Now in August I am already a week late (on day 33 and period usually comes day 27). 
My husband and I use condoms and the pull out method....not ttc but happy either way. 
What do you think? I'm usually very regular so this is weird for me. I took a test this morning and it was negative