7dpo???

I was 7dpo yesterday! I had af like symptoms and have been very tired, I was really cranky yesterday and had a lot of discharge. Is this af coming or is this a sign??? today is 8dpo my period isn't for another 6 days, I normally don't cramp this early. Just the day before my period. No sore boobs yet little nausea.. My boob are just sensitive, took a nap yesterday at 4:30 been wanting to go to bed at like 6! Is this a sign or af just preparing to come???