It appears that you may have had some wound separation (dehiscence) at the t-junction of your abdominoplasty closure. However, a higher resolution photo would be more helpful in providing you with a more accurate assessment. Wound separations do heal in time with local wound care, but it does take a bit longer than wounds that do not separate during the healing process. Thank you for sharing your photo and concerns. Best wishes.
The photograph demonstrates some skin and subcutaneous fat loss of the abdominal flap. Drainage is a byproduct of this wound phenomena and is usually not accompanied by infection.