Baby vomiting?

My daughter is 12 weeks old. She ate twice this morning, had two wet diapers, and a bit of a runny/mucousy poop.

She got irritable as the morning went on. We went to the park, she was grumpy the whole time. She wouldn’t eat at all. We got home and she was a bit sweaty. She didn’t appear overheated. she still refuses to eat. Then she projectile vomited everywhere.

Does it sound like a tummy bug? I don’t think she got too hot. I feel so sad for her. My toddler has never been sick, so this is new territory for me. She’s very sleepy and won’t eat. She ate last at 9:30. Her diaper was dry from 9:30-12:45. 😩 She’s very tired.

I called the doctor, but am waiting to hear back.