I am a day late. I have extreme fatigue and nausea. My breasts are also swollen. Is it too soon to take a test?

Coming from experience, only 1 day late doesn't necessarily mean anything. My wife has been 5 days late, and NOT been pregnant. If I were you, I wait at least a full week to really begin worrying.

One day is not late, are you on birth control pills, that regulate your period time ?

Many women are 4, 5 or more days late often. Also some women even miss a month every now and then.

Yes it is way too early to test. You will need to be 14 days late. Use the first urine of the morning. You can of course test now, but a negative reading does not mean it is negative for sure. But a positive now, would be pregnant. So you can test, but if negative and no period, you willl have to test again later