Need advice

So my mother inlaw has known for a little that we been trying and it hasnt been working its been a little over a year now we have a 4 year old boy hes awesome . I have got ultra sounds and blood work saying everything looks good . But whats bothering me is shes telling people my situation or she will tell people my sons wants a baby and then stare at me like if I cant give him one . Now am I over reacting or should she mind her own business ? I told my SO and he understands but wont say anything to her . Like im so sorry I didnt pop 6 kids out before I was 24 so easily . Its starting to really get to me and im ready to explode . What if the problem is her son cause to her she says the men in her family never fail so it has to be me . Im so upset help !!!