Late period

I’m now 19 days late but I’ve never had sex! I’m cramping a bit and getting a little nauseous. I’ve been stressed lately but honestly not getting my period just stresses me out even more and makes me MORE anxious even tho I know the odds of anything being wrong are very slim. I’ve talked to several other girl friends of mine and they’ve all told me “it’s ok. Mine doesn’t come some months” or “yeah mine does that too sometimes”. Although I’m irregular, this is still concerning. My diet, workout habits, and water intake have changed drastically this month as well so I’m award that all of these changes affect my cycle - it’s just still very concerning!! When is the right time to go to my doctor?