Thanks for the query.
Sometimes one of the fallopian tubes can be found blocked due to many reasons.
Though one tube is blocked there is still possibility for pregnancy
as the other tube is patent and she is ovulating.
You plan intercourse around the time of ovulation which will increase the possibility of pregnancy.
Your sperm count
For more details you can ask me and can send reports through this link: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429