When to start testing??

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Currently 6DPO and for the last few days my boobs have been so sore! My SO noticed my boobs and nipples have gotten bigger yesterday. 2-3 days ago I was cramping and been bloated/gassy. On top of all that I’ve had on and off head aches and feeling light headed from time to time. I have CM but I’m unsure what type. I’m eager to test now but assume it’s too early. I tested once yesterday and it was negative so when should I start testing again?!