Pregnant women in labor, or at risk of premature delivery, are currently connected to cumbersome electronic uterine contraction monitors to assess their contractions. Existing monitors are not only uncomfortable but also prevent the pregnant woman's mobility. In this paper, a method to monitor uterine contractions using passive RFID tags is proposed. Simulations have been completed using experimental data as a starting point to provide proof of concept for implementing a wireless and battery free uterine contraction monitor. Such a monitor can be easily integrated into wearable garments for comfortable continuous monitoring.