Advice for periods!

Okay, well first off the last period I had was May 29th. & I'm not even sure if I started then. I still haven't started & I'm like 9 days late. But all together I'm actually a month & 9 days late. I took a dollar tree pregnancy test the other day & it said negative but I'm not sure if I even did it right. & idk if it was accurate & I only took one also. Sometime last week I woke up with 'morning sickness' as some would say. It was bad. & my apatite has increased. & I had really bad headaches last week also. Idk its just weird because the last time my periods were irregular was when I was on the depo shot and it's been about 2 years since I've been on any type of birth control. If I don't have a period this month it'll be 2 months without a period. What should I do ladies?