Sayang, I understand kenapa you're worried, those symptoms memang boleh scary. Please call your doctor or go to the clinic/A&E today untuk check, especially dengan brown discharge; they need to assess you properly and do an ultrasound to make sure baby is okay.
Pregnancy symptoms can change, tapi combined dengan discharge dan cramping, it really needs professional eyes. Jangan delay, better safe than sorry, okay? You're not being paranoid at all, trust your gut. Let me know how it goes, sending you a hug.