I’m back :(

Back after a miscarriage. I’ve had four pregnancies thus far and we have one healthy, amazing baby. Why such shitty luck tho? I know others have it worse, and not trying to downplay how grateful and fortunate I am for our healthy baby and the ability to conceive. But if chances of miscarriage or relatively low like 1 in 4 at highest right, why do I keep having them. Just venting really. Going in for blood work per nurses suggestion to check some stuff. Anyone ever have that done? Anything found?