I have been on bc for 6 years and just finished my last period on October 26th. I missed a bc pill on October 27th but took it the morning of the 28th. I had sex without a condom and he finished in me on October 31st. I am due for my period in 4 days. Currently experiencing sore boobs which is usual before my period. I also woke up this morning and was spotting reddish/brown when I wiped. I was wondering if this could be implantation bleeding and i could be pregnant or am I just freaking out?