Hi. Thanks for your query, You have not mentioned that whether your periods were regular earlier. As two pregnancy tests are negative, chances of pregnancy are almost nil.However for confirmation USG scan may be done. Nausea and bloating may be due to acidity. Causes of breast itch vary and may include insect bites, allergies,dry skin, new soap, synthetic bra, infections,pregnancy and trauma. Breast itch can also be a symptom of inflammatory breast cancer, an aggressive form of breast cancer. Most causes of breast itch are fairly mild and should not be a cause for concern. Treatment of the itchy breasts should be directed at the cause. Try to wear bras made of light fabrics with good ventilation. Do not use tight fitting bras or lingerie. Always practice good hygiene – regular bathing with thorough washing around and under the breasts is important. Dry your breasts throughly after bathing and avoid strongly scented creams and perfumes. Hope it helps you...