Female bulldog first menstruation

Question
Hi,
I have a 5 almost 6 month old female english bulldog.  She has been having to go to the bathroom alot.  I mean it seems like every 20 minutes.  I was wondering if this was a common sign of her first menstrual period.  
Also her head has not been growing at all and her body seems to be almost full grown.  I was wondering if this is normal??
And finally what is the difference between a olde english bulldog and a regular english bulldog.
Thanks I know it is alot but I really do appreciate it.

Answer
This constant urination is a sign of a urinary tract infection and she needs to go to the vet asap. She's young to be going into a heat cycle anyway.

Female Bulldogs don't usually develop the impressive heads seen on the males This is quite normal.

The Olde English Bulldogge is an entirely different breed than the modern AKC Bulldog.  They are larger and for the most part, much healthier dogs.