Missed period and no BFP

Hi everyone, I last had my period on 30th October and started pink discharge on/around 5th December. Faint spotting after, and I had flashy smiley faces on 12th/13th December so was very confused! I've had sore breasts and nipples, bloating, cramps, lower back pain for nearly 2 weeks. Was alert and now v tired for the past week. I decided to test and the result this evening was negative. I wonder if I tested to early, some forums have suggested that pregnancy isn't always detected until 4-6 weeks after a missed period. I'm wondering if something is wrong with me (I have been stressed, have a history of PCOS but the gap was closing on my cycles...and now this has thrown me 😥). Thanks in advance ladies