I did. It only was a problem because I wanted to get pregnant again. Apparently for some women just the tiniest twinge can make their hormones wacky enough to stop ovulation. I breastfed for 8 months and didn't get my period for 2 years.
Two things to try - check with your OB about some synthetic hormone that can jumpstart things if you're trying to get pregnant. I can't remember the name of it, but I only had to take it once or twice and my period started again. Or, and this sounds a little weird, try a chiropractor. I threw out my back something awful a couple years ago, and started seeing a chiropractor for it. Well, of course they say they can fix everything, and my doc was saying stuff about menstrual cycle, etc etc. I pretty much tuned it out. But ever since I started going I have been very regular, and I was never regular at all before that. Can't hurt to try.
Anyway, unless you are TTC, I wouldn't worry about it. As soon as you get that period, you'll wonder why you were missing it : )