Post Partum Periods?

kperk2zw

So my little one is 11 weeks old today, and I have been getting my period every 2 weeks.  It's happened 3 times in the past 6 weeks.  After the lochia after delivery stopped I had a break and now this has been happening.  It lasts a few days, like 3-5, at a time.  I am breastfeeding, so I was hoping I wouldn't have it for a while, but apparently I was mistaken.  

Anyone else have this happen?  Should I be worried?  I'm sure my hormones are just getting back in check, so I haven't called my Dr yet.  Thanks!