He put the tip in for a second during ovulation. he ejaculated about an hour before. likelihood of pregnancy?

Low likelihood: Did he wash after his previous ejaculation? If there was any sperm, it was a very small amount. It's possible to get pregnant this way but very low possibility. If concerned, talk about it with your doctor. And, maybe be more careful next time (condoms, birth control, abstinence).

Possible: Low but you should see gyn and have testing.