Vacation gone wrong.

Don’t judge me I know I’m wrong but it is what it is. I went to Japan on a vacation and had a one night stand came back to the states pregnant but didn’t find out till 14 weeks & had sex after that I thought it was the boy in the states we got a dna test & the baby isn’t his. I’ve lost all contact with the guy in Japan. Even forgot his name. What should I do?