I'm in the same exact position. Well baby number one was conceived ONE drunk night. It's crazy. I have a few friends who have been trying for years. I know they do blood work. And one friend has had an ultrasound and dye sent through her tubes and found out they were blocked! When I decide I'm ready my doctor will start with blood work and the ultrasound test. Good luck! 

When I saw my gyno I had temperature charts to talk about and I was having irregular cycles so we discussed the range. He also asked if I was using ovulation tests and how long my periods were. He was going to send me for blood work and a hsg but a few days later I found out I was pregnant.