Looks like my syringe was empty when I injected!

[dogzrule]

Sooooo, I'm doing my fourth injection of estradiol this evening and pushed up a little on the needle until I saw a little drop and saw nothing. I pushed all the way up, and there was nothing in the syringe! So I just redid it correctly. But it made me realize that I forgot to check for that drop the last time, maybe the last two times! Has this happened to anyone else, and if so, did it screw everything up? I'm on the injection once every three days, so there have been four injections. I go in to check my e2 and lining tomorrow but am feeling so upset that I may have messed this all up.