how early do the signs of pregnancy come?

Nausea and fatigue may occur as early as 2 weeks after conception. Changes in the cervix, such as softening, occur as early as 4 weeks. Fetal heart tones can be heard as early as 7 weeks by transvaginal ultrasound, and around 8 to 10 weeks by hand held Doppler under ideal conditions. The breasts become enlarged after 6 weeks and colostrum secretion may begin after the 16th week. Braxton Hicks contractions usually begin after 28 weeks. The first fetal movement is first appreciated (on average) at 19 weeks during the first pregnancy, and as early as 14 weeks during subsequent pregnancies.