Please kindly see a gynaecologist as you are having an abnormal pattern of vaginal bleeding. You would benefit from a full consult and investigation as appropriate.
Hope this is helpful.
Best regards,
Dr Ong Yeu Theng Charas Specialist in Obstetrics & Gynaecology
Usually pregnancy test can be done once your wife has missed her next period. Untimed frequent intercourse say 2-3 times a week is adequate. All the best!