Implementation bleeding or AF

I’m 5’8”, 156.8lbs, vegetarian, run 3-4x week 1.25-2 miles (just started this 2 weeks ago). Had IUD out July 2016 but started actually focusing on tracking and ttc as of March 2017. My husband is also fit and healthy. 2 prior pregnancies with surgical abortions, no complications, both before 8 weeks, 7 years ago. I feel like my cycle is normally about 29 days but around my wedding I had slight changes (July 8, 2017). Tonight is the end of day 30 of my cycle. I didn’t have my usual cramping and my breast soreness has lasted double as long (10 days today vs 4-6). I broke out horribly about a week ago and still fighting that which usually doesn’t happen. But this evening I noticed very little light brown/pinkish discharge when I pee. I stuck my finger to check it I attached a photo. Usually I start my period with a heavy flow. It’s very scant amounts. Took a

pregnancy test day 28 & 29, both negative but both after drinking. Any thoughts, advice or supportive words appreciated! Thanks ladies