Pinkish Brown CM 12 dpo?

With baby #1 we were def NOT ttc.I got my AF right on time,3 days of brownish pink discharge and mild cramps.Next month when I was late I took a hpt and got a huge BFP.Thought I weas about 4 weeks pregnant-turned out I was 9 weeks and my dr had to explain implantation spotting to me lol.Baby #2 didn't have any of that but I did have horrible PMS type cramps up until the 4th month.Baby #3 got my AF a day early (I know no biggie) and had mild cramps with on and off pink spotting all that week.I thought it was just a funky period and it haden't happened for us that month as we were ttc.Surprise-2 weeks after that I got a BFP and a blood test of HCG levels confirmed I had been pregnant during that episode.My dr thinks I got pregnant late like around CD 20 of a 26 day cycle so my body was just really trying to have a period since it haden't gotten the message so to speak.Good luck.