Are these signs of seroma or infection? Should I be worried? (Photo)

Dear dollface.8858,it is hard to tell for sure without an examination but based on your photo, it looks like you might have healing problem. I would suggest you to consult your plastic surgeon. Only after a thorough examination you will get more information and recommendations. Until then keep your wound clean and covered. Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  
Member, Am. Society of Plastic Surgery

I appreciate your concern!
I suggest an evaluation of this area by your plastic surgeon as soon as possible. Pressure, pain, fever and draining wounds should always be reported to your plastic surgeon. 
Good luck. Dr. Aldo

From a photograph, you certainly have delayed healing. The fullness of your lower abdomen may represent and infection or seroma, or both. This needs an evaluation by your plastic surgeon who could give you much more information after an examination.