Darling, I didn't get mine back for 9 months after my daughter. Be SUPER thankful that you don't have to buy feminine products on top of diapers at the store yet. Plus, any birth control you may be on will influence that as well. I have a Mirena in and probably won't have any sign of a period except for the occassional spotting. I am glad that I only have to have a small box of panty liners on hand for those days instead of worrying about whether or not I have enough on hand to make it through a period.
It is truely a blessing that you haven't had your period yet, relish it! Oh, and don't be fooled, just because you haven't had a period, doesn't mean you can't get pregnant. Be careful about that!
After reading through a bunch of the other responses, I have to say that, in my experience, breastfeeding had nothing to do with it! My sister breastfed and she started 3 months after giving birth. I breastfed and started 9 months later. My sister breastfed to about 6 months, whereas I bf until about 15mo for my daughter and 13mo for my son.
Just give your body time to recover. It has been smashed, contorted and dragged through the dirt for nine months; then it all ended within an day. It is trying to figure out what is going on. Everyone is different and we all recover differently. Don't worry about it at all!
God Bless!