Disappointment depression

Kalena • Me and my fiance made the decision to start trying about a week ago. We are hoping to conceive really soon even though the likelihood hood isn`t very high.
Me and my fiance are trying to conceive and after everytime we have sex and I experience even the slightest symptom I put it in my head that I'm pregnant but then when the test comes back negative I get really depressed. What's the best way to deal with that?