Never will it be!

I guess I'm just not meant to have babies... Feeling really depressed today. It's been so long and nothing...I know I'm just overreacting a little but I'm so discouraged. Especially when my doctor says oh honey nothing's wrong with you..good things come to those who wait...well it's been 4 years lady! I've been checked but my SO hasn't and it has me really worried. How can we be together for 7 yrs and have unprotected sex for more than 5 yrs without any incident at all! I'm sorry I just need to vent some..