Help and advice!??

I am currently 27 weeks pregnant and today I woke up with a stomach ache. It’s not any cramping or severe pain just a normal stomach ache but I cannot drink or eat anything without throwing up I am not sure if I should be concerned or just sleep it off. Not sure it’s whether I drank or ate something yesterday that upset my stomach today. I still can feel the baby moving around but it’s just I feel sick. Any advice should I be concerned. I tried reaching out to my OB but she is currently in not at the office and I don’t have her personal number.