Sad ttc six months feels like a lifetime

Today marks the official sixth month my husband and I have been trying to conceive :/ we've decided to try for three years since that's how long it took for us to get pregnant with our first child and we also have three years until I go to pharmacy school full time and won't be able to go through pregnancy and school. Weve officially talked about adoption and I guess that made me upset because I feel like I've lost faith in myself and my body. I went through two misscarriages before having my son so for me the worry isn't over when I get that positive pregnancy test. My family is beautiful as is but I always envisioned a big family. I read other women's posts about how sad each month is and I feel exactly the same way.