omg 

Do you know your own body? Can you differentiate the external from the internal genitalia?

You said you had no intercourse, I assume your bf only performed oral and or probably touched around your clit. Suppose that is true (that is no intercourse), his semen at most only ends up at your external genitalia. That is on the outside end of your long long birth canal!

To make a baby, sperms need to swim up all the way through the birth canal, AND then up again to the upper portion of the uterus, bordering the Fallopian tube.

Can sperms swim THAT far?

And let's not forget that the uterus is hollow. It is not filled with water or any liquid. Is it a conducive environment for semen to propagate and for sperms to swim?

No and no.

There's a reason the part that delivers spermatozoa in the male reproductive system is long.