Im so scared that we have mono!?

ok so today me and my friends met a couple guys at the mall and we kissed them which was prolly stupid but whats done is done. they are all visiting america on a summer camp thing from venezuela. we are all scared that we got mono....!?! should we go to a doctor or something? [[none of them looked sick and i didnt see a single one cough or what ever...!?!]]