It is not uncommon for a midwife to have difficulty feeling the expanding uterus at 12 weeks of pregnancy. The size of the uterus varies from woman to woman, and factors such as the position of the baby, the mother's body shape, and the experience of the midwife can also affect their ability to detect it. In most cases, not being able to feel the uterus at this stage is not a cause for concern.
However, if you are feeling anxious or worried about your baby's well-being, it is important to communicate your concerns with your healthcare provider. They may suggest additional tests or ultrasounds to ensure everything is progressing as expected.
Remember that every pregnancy is different, and there is a wide range of normal variations. Trust in your healthcare provider's expertise and seek reassurance if needed.