Am I pregnant?

I’ve been getting brown discharge (at first light and not a lot. now there is a lot of it and it’s dark) before my period is supposed to start in a couple of days. I’ve experienced brown discharge after a period but never before. I looked it up and it says this could mean early signs of pregnancy. Is this true? I’ve been very careful with my sex life. I always use a condom, I know when it breaks, and my partner never finishes in the condom ever (I give him oral to get him to finish). I don’t understand how I could be pregnant if this is actually showing early signs of pregnancy. Please help me out and let me know your thoughts/experiences/knowledge.