Hello, All above clinical features are mostly associated with early sign of pregnancy, related with failure of contraceptive pill or irregular using. Light brown ring around nipple is also seen in pregnancy. Therefore, you should undergo one home pregnancy test with urine initially and blood test for beta HCG to confirm/exclude pregnancy. In exclusion of pregnancy, other close possibility is PMS. It can be eliminated by life style modification, taking healthy diet with drinking more water, regular physical activity or yoga, avoiding stress/ tension, taking sound sleep and necessary medication. Be well & take care.