I already posted a question when I was 4 days late but it's not letting me respond

Since then I took plan b again when I was about 6 days late. . I know it probably is only going to mess up my period more but I was and am so stressed.
A few days ago I took 2 pregnancy tests and they were both negative. My real question is: am I most likely not pregnant? Or was it too early to tell? I'm so stressed out..