Pregnancy tests are available at the Dollar Store, very, very inexpensive.
Also, a sperm count of 0 in 1988 after his vasectomy does not mean a sperm count of 0 in 2011!
A home test is not that expensive.
there was documented proof and moneys tight
What has kept you from testing? Did the boyfriend have documented proof that the sperm count went to zero after the vasectomy?