Frustrated!

At first we were so excited to open this chapter of having another baby and now almost a year later we still haven't been able to get pregnant:( I have two little girls and feel so blessed to have them. We want to add another blessing to our tribe but I just had my second month of clomid and finished my first month of progesterone vaginal (I have extremely low progesterone level) I am due for my monthly tomorrow and took a pregnancy test this morning and it is negative. I feel so sad thinking this may not happen for us a third time. Anyone else gone through this?