fed up with periods

So, I don't know what's going on but for the second month in a row my period is late. I'm going on 20 days late, and haven't had any signs of starting it. Every time I take a pregnancy test, I get my period a couple days after. So do I wait a few more days and take one? I'm tired of spending money on uneeded pregnancy tests but I worry that I might be when my period doesn't show 😂. Is it normal for your period to be late regularly? Could my cycle be changing? I need helllpp! 😭😭