Usually nothing, majority of women do not show signs until at least 2 weeks minimum. Although sometmes women do show symptoms early but only morning sickness. If you think your pregnant, wait another...
Missed period (or possibly 2 missed periods) Positive pregnancy test
Feeling sick/actually being sick
Certain smells/food/colours making you feel/be sick
Food cravings
Increased OR decreased...
Heartburn, nausea, increased vaginal secretions, headaches, mood swings, constipation, backaches, feeling like you have a cold, light spotting like a very light period, tingling in breasts, nipples...