Around six months ago, I did some light solder work in my room. I was pretty reckless with the lead solder, and even ate while soldering on several occasions. Should I be worried about the lead exposure? Since soldering in my room, I have vacuumed and wiped down my desk several times. Could small pieces of lead still be present?
Well, yes lead is unhealthy, and eating while soldering is not smart, but I doubt if it was not for an extensive period it will be ok.
Afaik the smoke is much worse, but it's not really needed to vacuum your room every time.
What I normally do while soldering (which is about once per month or less): open window (ventilation), and using a fan that blows the smoke away from me. I have a thick jacket so I can do it even in the winter (while window is open), and wash my hands afterwards (and not eating in between). Also the fan has a heater so in the winter that's an advantage too. Also make sure you do not inhale the smoke when you are close to your components to solder. In the few cases I accidentally forgot to switch on the fan and you smell the fume, strongly breath out.
However, there are better solution (a device that sucks the smoke instead of blowing it away).
It is not expected that occasional soldering activities that take place within areas that are well ventilated or have additional local exhaust ventilation will pose an occupational hazard.
Wash hands and nails. Avoid inhaling smoke trails.
It is the lead oxide dust that evaporates from the liquid solder that can accumulate and migrate to increase long term risk.
A one time light-soldering is relatively benign. https://www.cmu.edu/ehs/Laboratory-Safety/chemical-safety/documents/Lead%20Soldering%20Safety%20Guidelines.pdf