Every bad trip is ultimately psychological; there can be outside stimulus that creates stressors that can trigger a bad trip but in the end its on you and your ability to modulate your mindset throughout the trip. The key to having a good trip is planning it with the right setting, company, and current mood going into the trip. If any of these aren't lining up, I'd suggest its best to wait until you feel you've found the right moment where all of these are good.