I've been on what I think is my period for 10 days they're never this long and it my first period since having a child 6 months ago is this normal?

Probably normal. Your first period after having a baby can be unusually heavy. If you are breastfeeding full-time, you hopefully got a break from your periods! if you are starting to wean and this is the first period, it is not unusual for them to be longer/heavier than before. If it continues or you have spotting in between, you should see your doctor for a possible ultrasound.