Okay so I haven't had my period this month and a took a pregnancy test and it was negative

When (at what time of day) did you take the test? When was your last period?

What can happen? You still might be pregnant.

How late are you and when and at what time of the day did you take the test?

Sometimes cycles can be off schedule. Wait several more days; if still no period, try another test. Follow the directions carefully. If test is negative, see what happens when your next period would be due. If you feel pregnancy is still a possibility before that time, see your doctor for a test there.

AS noted by others.
1. how late are you. A few days is not really late.
2. if you are over two week late, take a pregnancy test.
3. take the test first thing in the morning, as soon as you wake up. First urine of day.

If still negative, repeat each week, till next period is due, if sill no period. See doctor