really frustrated!!! delayed period + negative test

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so the last time i had sex was probably 3 days before my last period (dec 15). this month my period has STILL not arrived. im 8 days late. however since yesterday I'm getting mild cramps and sore breasts. my skin too had been breaking out throughout the week (happens to me during pms but I never get cramps during pms though). i tested with home kit today and it came out negative. i was also down with the flu for a couple of days last week.

all im super frustrated and not able to figure out whats up. im barely ever late and if so, its for a day or two max. girls please help me understand whats happening im freaking out.