If it doesn't work out that way (like, troll-dose changed by one third, or one half and the pill is hard to cut, or it's a pill you can't cut), you can also ask the pharmacy. I did that for another medication. [mods: not related to HRT at all, so no wrath, 'kay?]
I was taking 30 mg of Vyvanse (attention deficit disorder med) daily, and the doctor prescribed 40 mg, but I had just gotten my month's supply a week before. So I asked at the pharmacy, and they gave me 23 pills of 10 mg, that I took with my remaining 30 mg ones, and 7 40 mg ones.
Depends on the medication, of course, but sometimes, there's a variety of dosages available to allow this.
PS: You have a... fax?!