What will happen if i used a saline laxative enema in my vagina instead of anus by mistake?

No harm: No harm done. The saline comes out immediately. Basically you gave yourself an unexpected douche.

No prob: Hi. Assuming the nozzle hadn't been in your anus since it was last washed, no problem. I have to say, the holes are pretty different, and I think if you're confusing them you need to pay closer attention. Anatomy lesson in the diagram. Good luck!

A douche instead: It will simply flush the contents of your vagina out if it just contains a hypertonic saline solution although it might cause very mild irritation. Overall, it should be very innocuous.

Vaginal douching: Hi, just flush the content out and you should be fine.

Irritation: sometimes you might find it to irritate the lining. However, as a whole, a one time incident should not produce significant issues