Disheartened and ready to give up

So I got my nexplanon removed back in march. Me and my husband have 2 amazing boys and I'm blessed to have them (especially since my first child had a twin I miscarried). Both my pregnancies came easy, we got pregnant within 2 months of going off BC. Now we have been trying to get pregnant again to try for a girl and it doesn't seem to he hapoening. Last month my period was 8 days late before it started. Now I'm 4 days late again and getting yet another negative pregnancy test. I'm ready to resign myself to the fact that I won't get pregnant again. I'm lucky enough to have 2 healthy babies since I know woman who don't have any but it still feel heartbroken.