Blowjob during pregnancy

I was just wondering if its safe to give a blowjob during pregnancy? Is it ok to swallow any precum or cum? 
Update:
Im sorry some people think this is a stupid question. I wasnt comfortable asking my doctor so i asked here. 
I do also would feel like gagging my first trimester but im better now. 
Thank you all who were kind enough to reply and not laugh at me. 

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