irregular?

Hi,

I gave birth 11 weeks ago.
I'm exclusively breastfeeding.
I got my period on 25-12.
I had some flow for 2 days, so until the 26th, and I managed fine with 1 tampon per day...
On the 27th, I didn't have any flow at all, not even brown discharge.
Now, this evening on the 28th, I've started flowing again.. bright red blood.
Is this normal?

Cheers