WHY am I throwing up?

It's usually about the same exact time every night or every other night. I get an extreme sense of nausea and I vomit my guts up. I just had a period the week before last. There is a possibility that I am pregnant but I don't think that's why I'm throwing up. I have been throwing up since I got a stomach bug two weeks ago that was circling around work. That ended but the throwing up hasn't. And if in pregnant it happened 5 days ago because I got off my birth control and decided to use condoms with my SO and it broke. But I'm so sick of puking. Currently holding onto a trash can incase I throw up again. I am soooo sick right now and even more sick of being sick at 9:30 every night. What heck is going on 😥 I promise tomorrow I will feel amazing all day and go home and throw my guts up. I don't know what's happening.