Please help

I've been on birth control pills for over 4 months now, I started a new pack the 25 of September and me an my bf had sex within a two week period when I wasn't on the pills due to me not being able to afford them, but he pulled out then we had sex Oct 5 while im on my pills and the next day I started spotting brown black blood , not enough to fill a tampon..

im.still currently spotting so it's about to be two weeks but the color isn't as dark as it was a couple days ago, I'm scaring myself because this has never happened before

so of course I Googled it and frightened myself by reading the worst possible things it could be.. any advice ?