Why does it have to be this hard????

Ok, I don't want to complain but I'm in desparete need of some comforting words. We're  going on 9 years of ttc. I'm not old yet since we started at a young age, I'm 27 and dh is 29 . And right now I have 3 sister in laws that told me they were pregnant. One of which who has a 4 month old baby and wasn't ready for another one. It makes me wonder...why dear lord, WHY does it have to be this hard?