How to find out if estranged wife had sex with someone else?

Q: My wife hasn't been staying with me for the past six months. Now, she wants to come back. Is there any medical test that can detect if she has had sex during this period? Or maybe has been through an abortion? Where can we get this test done? We have a two-year-old kid.

A: With so much suspicion in your head, your reunion is bound to fail. If you both want to get back together, forget the past and think of the baby.