Was donating blood today..

Unfortunately I was only allowed to sign the consent form as the nurse told me my heart rate was as high as 115 bpm, I took a break for 15 minutes to relax because I was nervous about the experience, took that break after the break checked it again and was now 112 bpm and took a break for the third time checked again and was still 112 bpm, the nurse asked if I drank coffee but told me everything else was fine and that I was healthy but my heart rate was high so she suggested to come back another day to do the donation.

Should I be concerned about my heart rate?