Losing all hope

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My husband an I have a 4 year old an have been trying to have another but this just don’t seem to be working we have been trying for a year now it it seem like there is no hope 😔 when I had my son it was a high-risk pregnancy I got to 9 months an that night went into labor have my son by c-section he was 4 lbs. 4 oz 17in long an I had him 4 weeks early but end up being very healthy I just don’t know what’s wrong