A few years ago the company I was working with did tests on employees that worked on continuous soldering lines. Some worked with hand tools, including soldering parts on to PCBS, some worked on flow solder machines where large PCBs (PC motherboards) were soldered at a rate of one every few seconds. None of the employees showed elevated levels of lead or any other metals in the process, even after months on the production lines.
Unless you eat it (not recommended - and it probably tastes bad anyway!) you should be safe.
Brian.