u/Affectionate-End5526

I’m on my 2nd week of 0.5 of Reta but I think I’m too anxious of a person. I’m constantly checking my heart rate. HR jumps drastically while working out. Resting HR has only gone up slightly. Getting some tirz delivered tomorrow. How long should I wait to start it? should I just start when I was going to take my 3rd of Reta?

Thanks