should I be concerned?

So I'm nearly 3 weeks post birth and my bleeding has lightened up heaps and it's now the brown colour the doctor said it would be which is normal
But the past few days I've noticed sometimes when I wipe I have bright red bleeding
It's not enough to soak a pad and most of the time it doesn't even get on one, it's mostly just when I wipe and it's not even every time I toilet, it's maybe once or twice a day
My question is, is this normal? I haven't been doing too much exercise wise, apart from general housework and the groceries every now and then so I don't think I'm over doing myself but the fact it's bright red is bothering me
I also had 3 stitches but they don't hurt at all and I've had them checked and they were perfectly fine so I don't think it's them
Anyone else dealt with this and have any answers? Please respond!

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