NO. It isn’t.
Look up in dictionary:
~ rhythm
~ method
Uh - I looked up contraception in the dictionary....and I posted it for you.
The rhythm method is deliberate and it is intended to avoid conception.
Webster again
rhythm method
noun
medical : a method of birth control in which a couple does not have sexual intercourse during the time when pregnancy is most likely to happen
Birth control = contraception
Please quit arguing this; you are wrong, I am right.
method
/ˈmeTHəd/
noun: method; plural noun: methods
a particular form of procedure for accomplishing or approaching something, especially a systematic or established one.
So rythym-method must be a particular form or procedure for accomplishing a strong, regular, repeated pattern of movement or sound. Or it could be a method to stop strong, regular, repeated patterns of movement or sounds such as bedsprings, or the pitter patter of baby footsteps.