My First Time TTC

I've been trying to get pregnant since January and we've had no luck. We slipped up a couple times before we were married and I still didn't get pregnant. We both really want to have a child. The last time I missed my period by a month and took a test it was negative my hubby's face sunk to the ground. He looked so sad because we thought this was it. It was so confusing because my cycle has been 7 days long since I hit "puberty" but this time it was only 3 days, which I thought was implantation bleeding. And it's so depressing knowing that we aren't forcing it. We're just letting it happen naturally and nothing is happening I've heard you have to give it two years before going to the doctor. I'm just losing hope and feeling like I'm infertile any advice? 
And my husband and I are in our 20s. I'm tall and thin; my cycle usually comes every month and is almost always late by at least a week if that makes a difference.
UPDATE: found out I wasn’t ovulating. I started ovulating naturally recently. I asked my mom because it was something I’ve never been through. And I asked my husband he was like idk what that is bae maybe you should go to the doctor 😂😂 but I showed my mom a picture and she was said that’s me ovulating.