depends you can usually tell if interest levels are high enough to warrant a kiss. obviously if she rejects you the interest level is pretty low. ive held out to points where a girl has bluntly said "why havent you kissed me yet" or they make the move themselves. if i was rejected i would possibly neg with "why are you trying to kiss me i dont want your girl cooties".
feel it out more so you dont get rejected, i think the last time i was rejected from a kiss by a girl i was still in middle school
do a hug test and or kiss on the cheek playfully and check for the reaction then go from there