I agree with deborah. There is a very good chance that you are doing it wrong. Unless you actually see the hemipenes, you will never really know if you are doing it right, unless you have more practise and you are SURE of your technique. There are a lot of people out there that will make too many assumptions on the sex of their snake when they do not have the experience to do so.
I was having trouble figuring out if my bp was a female, (which I bought it as), a few months ago. I found a local breeder that was willing to probe her for me for free and show me how it is done. Turned out to be a male. Well, no breeding for me this season......I think you should find someone in your area that knows that stuff and give them $5 to do it for you. Then you can watch and know for sure if it is male or female.