When to test

Hi there! So I should be getting my period in the next few days (thinking anytime between tomorrow and Monday) but I’ve got some other symptoms that’s got me wondering.

I was supposed to have ovulated on the 26th but I BD that night and a few nights before. I tested for “peak fertility” on the 25th.

I really haven’t put any pressure on myself this month to conceive but I’m obviously aware of what’s going on. A few days ago I had a tiny bit of brown blood when I wiped but I only saw it the one time. And today I woke up with very sore boobs and a little bit of lower back pain and some cramping. Even had a dream last night I had a son lol. Anyway! My question is- how soon is too soon to test for pregnancy? Or when should I test?