Yes, but in reverse of what you are doing now. I was a phlebotomist while working on my RN. I worked where you describe- mobile drives and in the center. I absolutely loved my job. Donors are generally happy people- they want to be there, they want to get stuck, and they have wonderful healthy veins. The center I worked for was great to it's employees, and we all believed in the mission of supporting our community. As much as I absolutely loved it, that job is not for everyone.
The hours were very erratic. Some days were 4 hours, others 16. Our mobile drives were sometimes 3 hours away, so you would go to the center, get on a van, drive 3 hours, do the drive, then drive home 3 hours. Granted that you were paid for your travel time it was nice to be paid to nap on a van....but still. If I was married at the time the job would have been much more difficult and I would never do it if I had children.
My favorite part was the variety of people and places. High schools, churches (everything from Baptist to Amish), dental clinics, factories, Walmart parking lots... every day was a different place with different people. Once you stick your donor, you have 15 minutes or so to chat with them...so for people that love to hear stories and talk you will think you are on vacation.
The downside (or upside, depending what you are wanting in a job). It is not hard...it is not mentally challenging. The rules for donation are very clear cut and highly regulated by the CDC and FDA. The use of critical thinking skills is incredibly rare. As a charge, you are responsible to get your team there on time, set up equipment appropriately in the area provided, ensure your team performs their job per protocols and that no donors are injured in the process.
As much as I loved working for a company that was so positive, so encouraging, and with a job that was fun- I would never, ever, ever work there as a new RN grad. The clinical skills that you have learned will be gone, and returning to any type of clinical job will be difficult. With that said- I want to return to blood banking after I am tired of bedside nursing. My ideal new job would be an assistant director of nursing at a blood center...and eventually move up to DON.
Good luck with your decision and on NCLEX results...hang in there, I know waiting for results can be tough!!