Breakthrough bleeding on the 2nd month of BC?

Anxious monster here. I’m now on my second pack of BC and had my period on May 14th - 18th. Since I waited for a month I let my partner ejaculate in me on May 19th. I then started noticing watery looking, dried up brown discharge on the 21st and blood discharge 24th. Never had this during my first month of BC, or never really noticed it. I’m still bleeding to this day, 28th but less now with a new brand of BC.

I called my provider and she asked me to do a pregnancy test at their clinic, I did and it came out negative. I even did one for myself, negative as well. However, it hasn’t been two weeks since that day so I’m not sure if it would’ve came out positive. Now I’m put in another brand of BC in the middle of my previous pack.

I take my BC consistently, same time and never missed but I realized it’s basically summer in California and I sometimes leave my wallet in my backpack in my car for long period of time (3-6hours) and it would be so so so hot.

Out of anxiety, I worry a lot to the point I tend to think about frequent urination that it manifested irl. Then I tend to think about being nauseous and puking, I never do but whenever I feel like it I just burp lol. I force these thoughts out and they make me worry more especially on top of the reddit stories I read online.

Should I be worried?