I’m trying for baby number 2

Hey guys , I need some advice /tips I’m trying for baby number 2 and I can’t get pregnant I’m 23 years old and my daughter is 3 and she keeps asking for a brother and sister and I’m like I want a little one again too. My fiancé and I have been trying for a year now and nothing no baby. I went to the doctor they said I’m okay but it may be harder since I had a c section and he said maybe loose 10 pounds I have and still no baby .. i don’t know what else to do :( what are some tips / advice i can take ... help!