Was exactly the same for me Jenarry, I had gorgeous (well in my opinion anyway!) thick hair and lovely long nails throughout my pregnancy, and it seemed as soon as I had my baby my hair went to straw and was coming away in handfuls and all my nails broke off. :-(
Your body is still settling down after your recent pregnancy- things will right themselves eventually. However as spanner has said if you start to get bald patches then have a quick word with your GP.
If you want further reassurance why dont you have a quick word with your health visitor?