Depressed

My husband and I have been trying for over a year to conceive and obviously nothing has happened… I spoke to my gyno and because my husband is a trucker she recommend we have sex every single day he is home. It’s been almost two months and nothing. Recently my sister (whom has a family already) just told me she’s pregnant. I mind you she is on the depo shot, and wasn’t trying.. I find myself beyond depressed. I am a very bubbly person and now I’m just so withdrawn.. does anyone have any recommendation on getting pregnant?…