How soon do symtoms arise vs how soon can I test?

I am 8DPO today. Yesterday I was super lightheaded all morning and slightly nauseous. I also peed every half hour (more than usual) I am trying not to symptom spot and get myself worked up and excited but I am wondering how many DPO have other mommas had signs they were pregnant. I tested yesterday and this morning, BFN of course, but I still tested. This is our second month trying for our first baby