After Two Months I Feel a Pulling Sensation Under my Left Breast - Is This Normal?

It is not unusual to feel the tightness of the chest muscle at about two month. Exercises and stretching will help. sometimes and in some patients there id development of scar tissue around the breast, otherwise known as capsular contracture.. If breasts start to get harder then you might be starting to develop capsular contracture.

What you are describing is "Mondor's Syndrome". Mondor's disease (also known as "Mondor's syndrome of superficial thrombophlebitis"[1]) is a rare condition which involves thrombophlebitis of the superficial veins of the breast and anterior chest wall. It sometimes occurs in the arm or penis.[2]:827

Patients with this disease often have abrupt onset of superficial pain, with possible swelling and redness of a limited area of their anterior chest wall or breast. There is usually a lump present, which may be somewhat linear and tender. Because of the possibility of the lump being from another cause, patients are often referred for mammogram and/or breast ultrasound.[3]
Mondor's disease is self limiting and generally benign. A cause is often not identified, but when found include trauma, surgery, or inflammation such as infection. There have been occasional cases of associated malignancy.[4] Management is with warm compresses and pain relievers, most commonly NSAIDS such as ibuprofen.
It is named after Henri Mondor (1885-1962), a surgeon in Paris, France who first described the disease in 1939.

Since the insertion of the first breast implants in the 1950's this syndrome has been reported more frequently. Return to your PS to examine and diagnose this complication. 

At two months, you may be feeling scar tissue that has developed. You may want to review this with your surgeon regarding massage if that is the case.