Feeling depressed

I just got back from a wonderful vacation with my sister and now it's back to reality. Even on the drive home I started to stress about ttc. We have been trying about a year and no luck. We have conceived before (ended up having the abortion pill) so I'm not sure what the problem is. My egg quality and quantity was tested and they are fine. I have an appointment on the 18th with my gyno. I was so focused on The vacation that I barely thought about ttc, but now that it's over it's all I'm thinking about. Also, my friend just found out she is pregnant, had sex once and bam it happened. I would really love some advice because I don't want to feel so down anymore