Scared That I Messed Up...

My doctor told me that, although the vial says that there is only 600IU in it, it actually has 700IU. So, I was trusting him. The first vial worked that way, 2 exact 350IU doses. Then today when I was doing my Puregon shot (2nd one from the vial), I got to the little line right before the zero. I did not know what to do. Do you put in a new vial just for one click of the pen or do you just not do anything? Barry talked me into not doing anything. But now I am completely freaked out that I messed up completely. What if this "mistake" messes everything up and I don't get any eggs because of this? I am totally freaking out and nothing is making me feel better so far. It is too late to do anything about this shot today. I will have to ask at my appointment tomorrow.