Get pregnant from a handjob?

Hannah
Okay so I know this is probably a really stupid question but I'm right now dating the first guy I've gone further with than just touching over the clothes and last time I actually touched him for the first time and he wanted me to make him come but I was kinda scared that Some of his cum could somehow get through my jeans into my vag.. 
Can that happen? How careful do I have to be? I'm not on birth control. 
Thanks guys & don't judge please haha

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