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You can chant the same on Shukla Paksha first Monday. The mantra is dedicated to Lord Shiva and better can come out of it if the chant is done at a temple.
In case you cannot access a Shiva temple you may even chant the mantra at home, sitting alone. Make sure there are minimal distractions during the process. The spouse can also chant along with you and this will yield great benefits for your relationship. The mantra must be continued to be chanted for a minimum of 21 days.
Sometimes the Lord and planet of the 7th house gets inflicted this causes a maleficent period for the couple. The Rahu in 7th house of a horoscope can cause issues with your marital life.
In case the 7th Lord is currently lodged in the 6th, 12th or 8th house, your relationship will receive no benefic aspect.
The other Mantras that can strengthen your relationship are-
Om Mahayakshini Pati Mem Vashyam Kuru Kuru Swaha