First iui and found blockage

So I had my first IUI today and when they went to place the sperm in me they had a blockage. The doc was able to finally get it but only went up 5cm. They never said it wouldn’t work nothing like that. If I don’t get pregnant this round we have a plan to do a saline sono but I’m just curious if this happened to anyone else and but still had success. I did have a c section so there could be scar tissue but won’t know unless I do a sono. It only takes one strong swimmer to get thru right? Do I still have a chance?