Pre-marital counselling is suggested for all couples before their wedding day, not just couples who feel that they are struggling. The idea is to make sure you’re both on the same page before saying “I do”.
All relationships are unique and each one has its issues. If you and your partner are having problems, it’s better to seek help before you get into a “make it or break it” situation. The sooner you seek couples counselling to address your issues, the more effective your sessions are likely to be.