A lot of flowers and no fruit

I grafted pluot, satsuma plum and maybe some other plums on my peach seedlings last year, some took and some did not make it. Unfortunately, labels were all gone. They bloom this spring with small white flowers, but there are no sign of fruits. Do they all look like the same pluot( see pictures) to you? This is why there is no fruit?


plum flowers look preaty much identical. Those flowers have not fallen off so dont worry too soon.

Thanks. will report later