To be honest veggiewriter I never slept with guys too early on in the relationship, so they had to wait a little longer than even that. I'm certainly not celibate, but in today's world, there are a lot of things we can do besides sex to have fun - not to mention, its a dangerous world out there. I am a strong believer in building a good relationship with someone BEFORE sex, because sex is like whipped cream, and the relationship is like apple pie ;-) Doesn't matter how good the whipped cream is, if the apple pie is no good, the whipped cream can't fix it. ;-)
If a guy wouldn't call me because 10 days was too long for him to wait to whip it out, you can be damn sure I'm glad he didn't ever get a chance in the first place. I think you should be too. And yes, I think the guys you've dated in the past are no good for that reason. You deserve better, and you shouldn't have to entice guys by artificially removing periods from your body. You deserve better, and until you realize you deserve better, and ask it of those you meet, they are gonna continue to treat you this way.
My sister has the same issue with having sex too early, and gets upset when men treat her like an afterthought. I really do believe a man will respect you better if you aren't apologizing for not being able to put out right off the bat. BUt that's another thread, i think, if we so choose to have it. ;-) I really don't think, given all the info you've told us, that using the ring as you've described is the right choice for you.
And seriously, the nurse was probably trying to make you feel better, in her own twisted way. I'd go see one, if you can.