HSG and Possible Blockage

Dear Dr.-

I am 27 years old and have been married for 4 years and been TTC for approx. 2yrs. I have been diagnosed w/PCOS though I'm not over weight, but am not ovulating on my own. I had 4 rounds of Clomid, which did cause me to ovulate. We then found out the my husbands sperm motility was lower than adequate, which put a slight hold on things. He is currently being treated with antibiotics and his count has improved significantly over the past couple of months. I recently had an HSG done to rule out the possibility of a tubal blockage. However, the HSG was immensely painful and the radiologist affirmed that there was a blockage to the left tube, but the right was 100% open. My GYN was present and said he disagreed, explaining that my tube did not "dilate" indicating that he didn't think it was a blockage, but the dye mostly went thru the other tube b/c it chose the path of least resistance. Just wondering if it is likely that i have a blockage or if my dr. is right in thinking it might not be blocked? Also is there any hope for achieving natural pregnancy (aside from Clomid or other fertility drugs) considering my current situation? Any insight would be greatly appreciated!