bfn day of AF. 3 days late what should i do

AF was due july 5. I tested and got a bfn been ttc for the past 4 yrs after baby #1 and also had 2 mc in 2015.past week or so mild cramps, always hungry, breast would be sore for AF not sore, heavy breasts, always tired, constipated, sore throat and i never get sick in the summer, and starting today back pain.

Everything sounds good but got that BFN so i just dont. I feel if u don't see a line before period, YOU ARE OUT!!!

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