Swollen and tender breasts Soreness or tingling in breasts is one of the most common pregnancy signs. Early in pregnancy breasts will fill out and change shape as they prepare to produce milk. Breasts may become very tender and sensitive for a few months as a result. But, Teresa Pit-man, Douala and lactation expert, notes: “that not all women experience these changes, especially if they have been on birth control pills.”It is possible to know you’re pregnant in those first few weeks, some women even “know” from the moment of conception. Here are the very earliest pregnancy signs, that you might not notice.