OP, no, you are definitely not BU, at all. What a completely inappropriate question. Feck, I can be awkward in social situations, but this wasn't even one, it was a queue. She didn't actually have to talk to you at all.
Having worked n retail when I was young, I get the need to make small talk, but never about anything personal - as the sales assistant, have no idea of the context. For example, when I was 16 and working in a newsagents, once, one of the girls I worked with served a couple, the man was slurring his speech a bit. She came out with 'haha, your husband seems a bit pissed. Kind of early in the day for that, eh?'. The wife then informed her that her husband was recovering from a stroke. And was, understandably, damn pissed off. So, never assume.
Allthatshe wants, that is fecking awful, I'd have been fuming. Some pharmacists (not all, obviously) in my experience, think they are doctors. The little fecker in my local Boots is one - I once dropped in a prescription for strong painkillers (post MC), only for him to grill me when I was picking it up - why was I taking them, what were they for, had I not tried anything else? Was I supposed to share my full fucking story with him. They were prescribed FFS. Another time I went in to buy some Motilium, and he quizzed me as if I was buying methadone or something, 10 mins of questions. Needless to say, I no longer shop in that, or any, Boots. Put me right off, the nosy, jumped up little shite.
Sorry OP, hijacked a bit there. Really hope you are okay.