I find it frustrating!

My boyfriend and I have been ttc for 3 months. I have 2 kids already and so does he(all girls and we want a boy). For some reason it's taking longer than expected. I feel so sad when I keep taking these test and they come back with negatives. The second I walk into the bathroom he gets all excited because he really wants it to be positive and it's not happening. I'm getting down on myself for not being able to make this happen. Ugh!!!! 😕