Putting the pressure on!

Its driving me mad now! Me and my bf are constanly arguing over this he now has said that he had given up!! And is going to use condoms again as we are not getting no where!! What do i say to this?? Its like his blaming me when this is the most important thing in the world to me! I dont know what to do i feel as though this is ruining our relationship. Two of our friends have just found out they are having a baby and thats put even more pressure on! Its like he blames me for not being pregnant yet.. if it wasnt for this blog ill proberly be going crazy! Help me please!