Stomach flu and diarrhea

I know... TMI... sorry. :-(

I'm 13 weeks pregnant. I've had a cramped stomach since last night with light puking throughout last night and today. Tonight around 7p began a whole new story and I literally cannot keep anything down, and now have watery diarrhea. I've tried a plain piece of toast and some mint tea, came back up. A small sliver of a pear, came back up. Now even small sips of water are not staying down and I went from soft stools to straight watery diarrhea.

When is this too much and should I go to the ER? The severe puking has only been about 4 hours, but it all started lighter yesterday.

Any remedies or pregnancy safe options for the diarrhea?

Any info is appreciated. Thank you :-)