Question about Repatha

67F- after recently finding out I have a very high cardiac calcium score my cardiologist prescribed Repatha 2X month. My total cholesterol is 148 and LDL is 77 but he wants them much lower. I administered my first dose of Repatha this morning but now I'm wondering if I messed it up. I followed all the instructions and video. I didn't even feel it when I did it this morning and tonight I can't even see where I injected it (in my belly) and it's not sore at all. I figured I would be bruised and tender so now I'm worried I messed up. The cartridge was definitely empty when I was finished and the liquid didn't leak out anywhere. Does this sound normal? Thanks!!