About being pregnant

Patient: I’ve been on the depo shot even since i was 14 when i got pregnant, but i stop when i was 17. Now i’m 19, and i got back on it like two months ago. I and i haven’t had my period since then, i was spotting. Now i’m feeling sick like i have to vomit, so i really don’t know if i should take it serious. So could i be pregnant?