Welcome to HealthcareMagic.
Are you using any contraceptive
pills? If so , there can be a chance of delayed periods.
If not , you have high chance of being pregnant.It happens that sometimes , test doesnt show positive.You should consider repeating the test with early morning urine sample.If it turns out negative again , you should visit your Gynaecologist for better evaluation and scan.
Congrats and Good luck.