Am 4 plus 6 and bleeding


hi everyone am 4 plus 6 weeks and just noticed a light brown light bleeding is this morning I was pregnant this time last year and had a MMC and had to have a D and C I mc at 8plus 6 and didn't find out till my 12 week scan am so.worried I can't even think straight is this normal or should I got to a and e I have a little back pain but think that's because I slept funny and no cramping many thanks everyone