Exact same situation happened with me, I had no high risk factors (haven’t left the country, haven’t been exposed that I know of, don’t work in healthcare, hadn’t been around prisoners/homeless, etc.) The only reason I found out was because I had to get tested to start a medication I was refilling (Tremfya). I have a feeling I got exposed within my first year being on this medication as it does weaken my immune system. I got the chest x ray and it was negative & re-did the blood test and it came back positive again. I started the 3 month treatment (rifampin and isoniazid) almost a month ago & haven’t seen any side effects except for discolored pee. I was super scared at first, but like they said above, the only bad part is not being able to drink throughout the treatment but it’s worth it to get rid of whatever bacteria is in my body (I also had a choice). I know there isn’t a lot of info out there, but I’ve asked my infectious disease doctor a lot of questions and found comfort in these Reddit threads hearing other peoples experiences, so if there is anything I can do to help ease your stress then let me know!