HSG - one blocked tube?

J
So I had a HSG yesterday afternoon. It wasn't too painful, more of an odd pressure sensation but I had taken two ibuprofen an hour before my appointment.
The dye rushed through my right tube but couldn't get down my left. The radiologist said that doesn't necessarily mean it's blocked, it could have clamped up like a muscle spasm or all the dye could have rushed down my right side. She wasn't allowed to say much else as the result has to go to her consultant you'll write a report to send to the fertility clinic I attend. 
Feeling mixed emotions now as I wanted them to find a problem as we've been TTC for 18 months.