Confused

Jennifer

I’m new to all of this and have only been trying ttc for about a month. My af is due today 11/24 no sign just yet. I usually get horrible cramps the day before. And there wasn’t anything yesterday. My boobs don’t feel sore at all, but I’ve had nausea quite a bit off and on. Dizzy, headaches constantly, and lower back pain. Just confused on the whole dpo and when I should test?