12 days late! Tested a week ago last week, can I test again?

Anna

I was suppose to start 12 days ago. And I’ve taken 3 test. Two in one day. Morning and evening. And then another last week. They were all negative. And there’s only a few days left in this month so I’m wondering what is going on. I haven’t had any signs of AF and my cervix started out lower but as the days have gone by it has gotten higher and the opening feels closed tight