Hi Jo.
Sorry to hear you are having a hard time of it. Have you had an ultrasound on day 3 of your cycle or whats called a 'antral follicle count' - this scan checks how many follicles you have.
Do you have regular cycles normally? Have you temped? Have you any other confirmation where you think you might ovulate, like the fertility monitor?
The reason I ask, is my blood results, Day 21, never showed ovulation - I always felt I ovulated late, when I used to temp and use the clearblue fertility monitor - but because of my day 21 blood results I was told I dont ovulate. However, I happened to have my HSG on day 14 and they were able to see that I was due to ovulate 2 days later.
Try not to worry about the one blocked tube, if you ovulate from the good side, they should be able to help you.
When is your next appointment?