Bro I am not sure what its like where you live, but where I am you can refuse a shot and say it is against what you belive in, and sign a paper.
I have not had a tetanus shot since for about 20 years now mayb 19, and I have cut myself on rusty nails, and been stabbed by thorns the lot.
I am in no way telling you what to do though.
But find out because you should be able to sign a paper and say you dont want it. The just wait til you have finished your cycle and then do it if it puts your mind to ease
All the best