The first few days I vaped, especially with a strong clove-flavored juice, I noticed a change in the smell of my urine for sure, actually somewhat in-line with what I'd smell after smoking, but since I switched flavors these past couple weeks the smell has gone away. I'm guessing it's something in the clove oils in my case, as I used to smoke mostly kreteks as opposed to more traditional analogs like a lot of folks on here..but I wouldn't say an unusual smell is anything to worry too much about, especially if you're hydrated properly. If you start getting any sort of painful urination, etc, that's a good time to see a doctor about a possible UTI, but just an odd smell is probably not a big deal.
Come to think of it, when I was experimenting with higher nicotine levels, 36-48mg menthols mostly, I noticed another very distinct change in odor, and the only thing I can link it to is the amount of nicotine I was taking in. I do the direct lung inhale with vaping most of the time, I know most advise against it, it works for me, so it's what I do..not sure if that's a contributor or not. If I remember in the morning I'll try and DIY some kind of 48mg juice and vape that for a day or two, see if I can reproduce the effect with a different flavoring set, and I'll report back if I get the same odor issues from the increased nic level. It wasn't a nasty smell, per-say, just different, and the first thing to mind was 'bet it's the nicotine'. Just never did a repeat test since I stopped the high-nic regimen almost as soon as I started due to a decrease in stress level.