I'm currently 9 weeks pregnant. For me i started getting AF type cramps at 10 dpo. I also developed cold like symptoms: runny and congested nose... lots of mucus, sore throat, headache. My boobs didnt hurt anymore than usual and so when on 14dpo i started to see some tan color in my CM... i thought for sure i was beginning to spot before AF. CD 15.. the tan got a little darker, but again was just barely present in the CM only. CD 16.. slight brown in CM ... CM very watery... i went ahead and tested and BAM very DARK BFP. The IB was never heavy and was only there when i wiped to see the color of my CM. Never went on my underwear, and never was abundant.
I didn't ever get pink IB... but i heard brown or pink is a normal color for it. Good Luck!!! fingers crossed!