kollelman,
there are several large studies showing that vaccines are not increasing number of miscarriages.
There are also observations of effect on the cycle that seems to be affecting 1-2 cycles. Several studies just started in US abot it with expected results in Spring 2022.
There are also studies showing increased number of miscarriages due to COVID disease.
So, any family who is in this situation and is not taking a vaccine, should practice social distancing. hope you are advising this to your numerous contacts who report this to you.