Stomach flu or morning sickness?

I was totally fine and all of a sudden I’m throwing up along with diarrhea. Like a lot of both. I’ve purposely skipped my period for the second month now as I’m on the bc pills and my period would come at undesired times. My brother literally got sick right before me and has the same symptoms as I do. I’m just worried, but I’ve been good at taking my pills on time. If I’m late (the latest I’ve been was 2 hours, once) I use protection the next time I have sex. What do y’all think? I’m worried but I’m pretty sure we just have the stomach flu.