Trouble conceiving 1st but what about 2nd

So it took us a year and a half to conceive our first . My son is now a year and a half old and we have been tryin to conceive our second now for a couple months with no luck . I’m hoping this isn’t a year + wait again 😫 anyone have trouble the first time and better luck the 2nd??? I am beyond grateful we were even able to have my son but i really want him to have a sibling . As far as we know there are no underlying fertility issues with either of us