Maybe that's the way to go but only if you can really deal with it and live with the doubt. At least you have peace on mind with yourself, and I should imagine most STD's would've shown up on your test if that was the case.

I am a firm believer of getting checks when embarking on a sexual relationship, but I guess the damage has been done now emotionally, so it may be difficult to get her to go without her thinking the worst.

It really is up to you, difficult one. Perhaps leave it on a backburner for a while, and concentrate on your relationship now - perhaps she will feel better about the subject when she feels secure with you once more.

Good luck and be rooting for you both.