deffinatly dont worry about that now, just worry about today
there isnt really much you can do (short of keeping yourself healthy, eating right, not putting yourself in danger (sleeping around), and going to the doctor for checkups and such)
and for the future, it takes an average healthy couple a year (or longer) to get pregnant, so when you get together with this future man go to the doc to do std tests on both of you and for a preconception check up then have fun, most docs wont even do fertility testing until you have been activly trying for at least a year
~alicia~