You just have delayed your period by 2-3 days. It could be because of stress also.
The cardinal symptoms of
pregnancy in first trimester are:
1. Missing a period
2.
Nausea and vomiting
3. Frequency of urination
4. Breast changes : Engorgement, heaviness, tenderness, brownish discolouration of nipples and
areola, increase in areolar size and secretions through nipples.
Even with these symptoms, the diagnosis of pregnancy is done with clinical examination, urine pregnancy test and/or
ultrasonography about 8-10 days after missed period. Till that none of these can diagnose reliably.
You have none of these symptoms.
Wait for one more week. If still you do not get menses, you may go for urine pregnancy test and/or ultrasonography for detecting pregnancy. Another test -
beta hCG test can diagnose pregnancy just about 2-3 days after a missed period.
I hope I have answered your query. For any further information or advice, you may ask me direct question.