Totally unsure!

🎀*Lindsay*🎀 • 28 years old, Husband 31 years old, LG 11, LB 9, LB 9 & LG 19 months.
So, AF isn't due to make her appearance till 5th Oct, I've had cramps earlier this week, and sore breasts for over a week now! I've had brownish pink in my discharge too but only for a day. I got impatient and did a test I got BFN ?, does anyone think I have tested too early or is this AF on it's way? Been TTC for 6 months no with #2, it's been 8 years since I was last pregnant. Am I stressing too much? X