Miscarriage i tink so???

ok i am 5 weeks and 2 days pregnant. had 6 postive test since last week. last night when i wiped i had a very light pink smear of blood on loo roll then nothing all night, phoned gp he said its to early for scan so bed rest. then this morning when i wiped it was very brown blood (it looks old) and its been like that all day. nothing on pad just when i wipe. I had a slight pain by my belly on yesterday and have minor back ache today but only on right hand side, has anyone had anything like this before?? i had a early miscarriage 4 monhs ago but that was full on bright red bleeding straight away. i personally think i have lost it as i never have any luck