Brown discharge 8 weeks pregnant

I am 8 weeks and 1 day along with my pregnancy. Last Monday, I went to the doctors to confirm if eveything is okay with my pregnancy. That morning, after using the restroom, I saw a tissue/blood clot in the toilet, but no bleeding. Only when I wiped. I had a transvaignal ultrasound done, and they were able to find a the baby and heartbeat. Thank GOD. Two days after my appointment, I have been having brown discharge, mucus like, on and off. I do no have any cramps or My spotting is brown to tannish color. It has been almost a week now. My doctor told me that there isn't anything he can do if I miscarry, but put me on bedrest for 2 weeks. I am freaking out because I had a miscarriage four months ago. The last time I miscarried, I saw a pinkish/red color stain on the tissue. To note, I have a heathly 18 month baby. I never had any spotting/discharge with that preganancy. Has this happened to anyone, and they had a sucessful pregnancy? I am so so scared, and driving my husband crazy.