Hai, Iam 25 Years And Married 2 Years Back. I

Hai, iam 25 years and married 2 years back. i had an abortion after 2 months of my marriage as we were not ready to have a kid at that time. now iam not getting my periods properly ( some times 25 days late) and iam trying to conceive also. but the result is negative. please advice me why my period is not regular? and is it difficult to get a baby since i had an abortion? please help...