Just saw a brown smear at 17 weeks pregnant

Blessing

I went to the toilet after lunch and saw this brown smear at 17 weeks. I have not had any bleeding since implantation bleeding. This is my 2nd pregnancy with the 1st one ended in an early miscarriage at 6 weeks. I'm worried and called my doctor. Just waiting to be seen. I have to say I used a home doppler this morning and might have pressed too hard. I don't know if that caused it. #stressingout

UPDATE: my baby is now an angel. 💔😭 Had an ultrasound today no movement and no heartbeat. Doctor said baby died at 14-15weeks.