sex question

If there was no cum or pre cum and it was only in me for a couple of strokes should I be worried ?? 
My man tells me I have nothing to worry about 100% 
Yes I know to use protection this was just a quick in the moment 
Also ** he did not ejaculate before seeing me or anything like that so there wouldn't be any sperm in the pre cum for those who wonder on that topic.
I'm pretty confident I'm fine 
Just some reassurance even though my bf has already told me I've got nothing to worry about !
Thank you and all is much appreciated