Jealousy!

Every time I see a pregnant woman or someone with a baby/small child, I get so jealous. I try to be happy for my friends that are pregnant but secretly I hate that they got pregnant so easily and wish it was me. My husband and I have been trying for 9 months to get pregnant and 2 months ago we found out my tubes are blocked. I go next month to meet the RE to discuss options to unblock. I'm really hoping they can do something, we want a baby so bad and our son is always asking for a brother or sister. Honestly, I try to be happy for others but it kills me inside!!