I was feeling nauseous and threw up 3 times over the weekend. The nausea is back and I have a loose stool. I'm trying to conceive. Is there a connecti?

Probably not. Nausea vomiting and diarrhea are most commonly due to viral gastroenteritis. Very unlikely to be due to morning sickness. Ginger ale or ginger tea can help nausea. Call your physician if you don't feel better soon.
Nausea. Nausea is a common symptom for many illnesses. Since you are trying to get pregnant, doing a pregnancy test makes sense. If your symptoms continue, see you doctor. All the best.