What am I doing wrong?!

Me and my husband got married last September since then we have been trying to concive. I've been tracking my periods my mucus everything we can. I went to a doctor last year cause I thought I was broken. But she confirmed that yes I can have kids. I'm starting to get really discouraged because everyone around me is getting pregnant and I'm not. All though! I have missed my period by 2 weeks now but my periods are not regular and I have no symptoms of starting my period or pregnancy. I wanna take a test but I always get excited and they always come out negative :( what am I doing wrong