I am 28 weeks pregnant and my thumb and index finger on my right hand is numb. should i be concerned?

Carpal tunnel: Pregnancy is associated with fluid shifts and some swelling, and a frequent area of dysfunction is the transverse carpal ligament at the inner wrist. This can cause a transient local synovitis, and compression of median nerve within its tunnel. Your symptoms are typical. May plague you through remainder of pregnancy but reverses after labor and delivery. A wrist splint may relieve symptoms.