Can I be pregnant on the Depo shot?

I got my first Depo shot in December, i got it on the first day of my cycle & later that night it went away. My boyfriend and I had sex unprotected and I’m 9 days late. I took a home pregnancy test and It was negative. I don’t know if I’m just being overly worried, I just feel so bloated and dizzy 24/7. I have a doctors appointment on the 18th of this month at my gyno for a ultrasound for my ovarian cyst. Should I wait till then to tell her about this? I’m 19, can’t have a baby right now.