At 34 weeks multigravida with previous 2 normal delivery has an unstable lie with the present pregnancy. It can be due to:

Placenta pre can be associated with several other conditions, including malpresentation, unstable lie, preterm premature rupture of membranes, and intrauterine growth restriction. There may also be an increased risk of congenital anomalies; however, there is no association with any specific anomaly. Ref: Wagner S.A. (2013). Chapter 18. Third-Trimester Vaginal Bleeding. In A.H. DeCherney, L. Nathan, N. Laufer, A.S. Roman (Eds), CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 11e.