12wks 2 days and brown discharge

Do any of you ladies get brown discharge?

I’ve read that it’s old blood etc and not to worry, but it’s hard not to. I had a bad bleed at 9wks but scans showed everything OK.

I just wonder if it’s due to my size, or being constipated that it keeps happening.

No pain, but sometimes my belly feels uncomfortable. First pregnancy so nothing I can personally compare it to!