4 days late. 30 day on cycle. 2 negative tests

Hi all! New to this. So basically I do have a coil fitted and track my periods religiously since having my 1st 4 years ago, I’m 4 days late & day 30 in to my cycle, I’m usually bang on maybe a day or 2 out but usually am like clock work and took a test yesterday and today which both have been negative, what should I do? Just wait until period arrives? Or wait so long?