I usually come on my cycle the 20ish of each month but I missed last month and still haven't came on my period.

I assume the question is "why"?

Are you/were you sexually active?

And if you have had sex, have you done a home pregnancy test yet?

To your question yes. I also took a pregnancy test n it came back negative

Yes

To your question yes. I also took a pregnancy test n it came back negative

There are of course other reasons, any change in birth control medication, any use of Plan B, what about stress in your life, money problems ?