When to head to the hospital

I was just curious as to when you guys went to the hospital for labor. What symptoms did you personally have?

I’m wondering because I went to the hospital on Friday night and they doctor said I had no initial dilation and at around 3am I was at a 1. They sent me home once my contractions stopped and my potassium was up again. Yesterday (Monday) my doctor said I was at 2 cm and my contractions came back stronger and more consistent.

I’m just so tired of going to the hospital and nothing happening (plus it’s expensive) so I wanted to hear your experiences.