I had this several times early on, including an actual red bleed at 8/9 weeks. It's fairly common early on and does not have to mean the end.
I'd say mention to midwife and see what she says. If u get anymore or it goes red, call epu to try to get a scan. If they are reluctant I would pay for a private scan.
Actually I would recommend paying for an early scan anyway- the way I see it, I would rather know ASAP if things were ok or not ok. That could just be me though as i had a mc last year. X