Periods and stress

I’ve been extremely stressed out lately. On a scale of 1-10 I’d say I’m at a 15. Tons of changes in my life and all of them impact my future tremendously. I know I’m one to skip periods because of stress, but I haven’t had that happen in about 4-5 years, when I was in college. A few days late, sure. Being late stresses me out even more. Last month I fully expected to skip my period but it just ended up being lighter than usual. When do you think I should cave and buy a test?