Your wife is pregnant, considering B-HCG
being 115. But i would suggest you to meet your doctor for repeat B-HCG test and to consider stepping up her medications so that maximum support for pregnancy
can be given.Spotting is common problem in early pregnancy, especially after IVF. Close follow up is required in your case to see the increasing titre of B-HCG for healthy pregnancy. If B-HCG is falling then it can be a biochemical pregnancy.