I think you are overestimating the amount of power in these gravitational waves by several dozen orders of magnitude. To even detect these, we need to observe

I think you are overestimating the amount of power in these gravitational waves by several dozen orders of magnitude. To even detect these, we need to observe multiple pulsars over long periods of time in order to find minute effects only visible at galactic scales due to the nanohertz frequency of these waves. In other words, spacetime is being stretched and compressed at subatomic scales on a sinusoidal wave with a period of a month or so. It’s a bit like asking if cosmic rays from the Pinwheel Galaxy are affecting cancer rates.