I got another puppy yesterday, I am so excited

Well I got a 72 hour health check from the breeder. I brought her today to my vet. She said she heard a slight heart murmur.

X-rays were done and the vd looks normal, but the lateral she said looked a little funny (heart was a little bigger than normal. What should I do.

I'm going to call the breeder but I don't want to give her back, but I can't imaging loosing her in 1-2 years either. Help