So confused

So my husband and I aren’t trying for a baby right now. I have not been on birth control for like three or four months now. I plan to go back on it but the one I had just wasn’t working for me. We’ve always used condoms or the pull out method haven’t had an issue.

My period hasn’t come yet and it’s been like four weeks now ? My thing on here says I’m 3 days late? But I’ve been testing all week long and all negatives 🧐 I’ve used two different brands too. Is this considered normal? Or when should I be concerned?