I had a miscarriage a year ago had a slight bleed after it which only lasted a day and I've never had a period since. Could I still get pregnant?

I'm very sorry to hear about your loss.
Have you had a physical exam after this miscarriage?

If not, you should make a doctor's appointment immediately.

When I mentioned it to the doctor they said it was normal as different women take different lengths of time to get back to normal. But I'm starting to get worried as its been nearly a year now. I wouldn't like to think I couldn't get pregnant

Your doctor is correct that it takes different lengths of time for different women. A year seems unusual to me though, so you should follow up. As long as you're not having a period, you might not be able to get pregnant. Or, you could ovulate, get pregnant and your period would never come for that reason.

Either way, its time for a follow up to see what's going on.