TTC after successful births

Looking to see if anyone has experienced the same as me. My husband and i have 2 children, youngest is 3. Weve decided we want one more to complete our family. We were very lucky to get pregnant after just a couple cycles previously, but this go around has not been the same. Im 34, husband is 32, had my first at 28 so not real young. Weve been TTC now for 6 months, ive tracked ovulation and its spot on, we baby dance at the right times. All my recent labs are all good/normal and ive been on prenatal vitamins. Anyone else have a harder time after the "fact"?