Thanks for writing to us.
The brown spotting
at 14 weeks with a history of previous miscarriage
can not be normal. It needs to be investigated.
You need to do USG to see for lacental location, cervical length and fetal growth.
Most likely cause for this type of bleeding at 14 weeks is cervical incompetence
which can be confirmed with the help of USG. If present, you may need cervical encirclage.
Consult your gynaecologist.
Dr. Mrs. Sumeet Baheti