Want some tips....

Hello i am 25 and i tried to get pregnant last 3 months but not succeed please tell me it is normal or not and one thing is clear that is my periods are regular,,,,, before marriage i have 28 days period after marriage my period extend 2 days and period start after 30 days with precaution and after trying to get pregnant my cycle extend again 2 days and period start after 32 days so please suggest me what i do please is it normal or any other thing its a request.