Don't beat yourself up, we've all made mistakes. I was not a new grad when I started but was new to the ER and often times left at the end of the day saying to myself "what in the world came over me?". I'm sure your coworkers know and understand you will be nervous. My preceptors would share their mistakes and I knew I wasn't alone.
One of my "doh!" moments came when I was hanging an antibiotic and plugging in the rate into the machine (I was on my own at this point). The machine said the infusion would go over 2hrs. I looked at the order and Rx on bag and saw it said to infuse over 120mins...yup, I went out to ask a coworker (an ER & ICU RN) why the machine would give me a different infusion time and how I can override or fix it! DOH!! Usually I catch myself and answer my own question or realize my brain fart before I finish asking my question but this time it wasn't until she said 'well, 60mins in an hour and...' that I realized "OMG, 120mins is 2hrs". I was so embarrassed, I could feel my cheeks and ears turning red as I said "thanks" and walked back into the room. I am pregnant too so she just laughed and told me my pregnancy brain got the best of me.
Just take a deep breath and know tomorrow is a new day :)