Yes, this is very normal. It is called a "heat cycle", most female dogs come into "heat" twice a year. It is usually around six to nine months of age. She will be in for about three weeks and her little "privates" will be swollen. She is to young to be bred (my opinion). It is better to wait untill she is through her cycle and then have her spayed. You can buy little "panties" for her to wear to keep her from bleeding on furniture, people etc.
sandra
www.chloescustomharness.com
sandra
www.chloescustomharness.com