Trying to be positive

Hello all, I am on my 2nd cycle of IVF. My fertility doctor says that after this 2nd cycle I will get pregnant for sure. I am afraid that after the completion of 2nd cycle in case I don’t get pregnant, what will I do? I am just too much afraid. Can I have one more try for IVF from the start? Is it really possible? Any one in the same boat. I am Sorry for rambling with my stress but I don't know what to do next. I am trying to be positive and relax. Please help. TIA.