Blocked tubes.

I am having surgery in two weeks to check if my tubes are blocked and i am getting worried. I had endo 5 years ago and have had a few laperoscopys over the years. I fell pregnant 12 mths ago and had a missed misscarriage at 13 wks. Now have been trying again for 3 mths with no luck, what are the chances that my tubes are blocked? Can doctors tell when doing a d&c cos my last d&c was 26th of nov 07 and doc said all my reproductive organs were fine. I just so want good news. Also if i have had an infection what kind of symptoms would i have. My feb and march cycle i had bleeding mid month round ovulation, havnt had it since. Cycles are regular. Please ease my mind......