Last year I got both rounds of the Shingrix and was kinda lucky in that I got the 2nd one a week past the 6 month time frame. Pharmacist said it shouldn't be a worry, but I was sweating it the last few weeks trying to find the 2nd dose. Lots of availability for the first dose, the second one seemed much more scarce. Our local pharmacies wouldn't give you the 2nd dose unless you got the first one from them. Sounds like that is still the case. Both my dad and my older brother got Shingles, so I hopped right on the new vaccine as quick as I could. Hope you can get the second dose easily!