Stay away from them. The sounds could be scaring them. Let them get used to human contact. But under any circumstances, do not completely cut them off from contact, because they are highly social, and Its a good thing you got two piggies. I have one, and he is really too old for a companion, so I try to give him as much attention as possible.
So what you want to do is, get them accustomed to your presence. Talk to them. Hand feed them carrots or romaine lettuce. (they love it). Do this for a few minutes a day, and slowly increase time. Don't pick them up yet. Pet them once they seem comfortable. guinealynx.com