I need help!

Here’s my dilemma. Back in July I had sex with condom pulled out and didn’t come inside me. I took plan b for xtra caution and had my pd wk ltr after sex. Then a few days later had another one that was black and clumpy. A month later I had a whole wk of just light bleeding(not heavy like normal pds). September I took a test just to be curious cuz I get paranoid but it was negative. Literally Two days later I got my period so I started back my bc pills cuz my doc told me to. Since then each month I have light spotting pds which is normal on the pill cuz mine is Lo dosage so it make its light almost to none. So my question is. Me being pregnant is a far shot in the dark cuz I’ve had four periods since and I’d be about 6 months preg if I was and I’m not showing any. So pls just calm my mind ladies. Thanks!