Are my period days normal?

My hubby and I are TTC our first child , and we have been trying since October of 2015 and nothing. I am very regular with my periods , but they fluctuate with days . I can go 5 day or some would be 7 days. Then I would have a 30 day cycle till my next period then 29 , 28, then 27 and so on. So is this normal? Would this be messing me up to get pregnant? I'm just frustrated and sad , I thought I would get pregnant easily considering how regular I am. It's a lot harder then I thought also any tips would be helpful too . Thank you.