At 15 weeks, the fetus is more active and coordinated. Arms and legs move vigorously, and on ultrasound some babies are seen sucking their thumbs. The circulatory system is working well now. Your baby's many blood vessels are visible through transparent skin.
Your own circulatory system is also ramping up to nourish your growing baby. During pregnancy, your blood volume increases by 30 - 50%. You may notice that the veins on your breasts, legs, and abdomen are more visible. You may also have a stuffy nose — a byproduct of increased blood flow to the membranes in your nose.
Help your doctor or midwife monitor your pregnancy. Call your provider if you:
- Are bleeding or leaking fluid from your vagina.
- Have sudden or severe swelling in your face, hands, or fingers.
- Get severe or long-lasting headaches.
- Have severe or long-lasting pain or cramping in your lower abdomen.
- Have a fever or chills.
- Feel discomfort, pain, or burning when you urinate.
- Have problems seeing.
- Have severe chest pain or trouble breathing.