Haven't had unprotected sex but no period... and I haven't skipped a month before... I have had sex this momonth but it was protected.. I don't know what's wrong

You need to take a pregnancy test. No protection is 100%. However, it is not uncommon to miss a period every once and awhile. Just take a test and find out.

I agree with the above. Pregnancy is still a possibility, as no form of birth control is 100%. We have women on this site that got pregnant while accurately using 3 different forms of birth control. It happens all the time.

If your period is at least 2 weeks late, then try a pregnancy test using first morning urine. If it's negative then wait until your next period is due. If you miss it as well then test again, or go to your doctor for a blood test.