Late period negative test

I was supposed to get my period Friday and I still haven't gotten it so I'm three days late. 
Yesterday I took clear blue tests they were negative
This morning I took first response
It was negative
I'm scared
I'm only 19 and not ready for a baby
Please don't be rude ladies I just really need help
I'm not sleeping or eating because I'm so scared 
Have you ladies been through this? 
I'm scared and in no way ready for a baby