nausea and vomiting

I rarely get nauseated and rarely throw up. Today after I got up from being in bed half the day I threw up. I hadn't ate actual food since like 9Am this morning so I was thinking that could be a cause. I'm on the second week of my bc pills that I just started up again after being off for 3 months , I take my pill at 9PM every night. It's almost 9pm again. I don't have a taste for any food , I'm hungry but I don't want it , if that makes any sense 😷 and I've been using condoms and he has been pulling out with the condom on so I don't think I could be pregnant. What could be wrong? I feel like it was me staying in bed all day