I've never been pregnant but there are some signs that appear early on
Medical Encyclopedia: First trimester pregnancy (Print Version) Symptoms
Missed menstrual period(s)
Fatigue
Breast enlargement or breast discomfort (tenderness)
Abdominal distention
Nausea with or without vomiting
Light-headedness or actual fainting
Skin areas appearing abnormally dark or light
Signs and tests
From what I understand - the area around the nipples darkens pretty early on.
If you have been taking your pills regularly, chances of conception are pretty slim (though not impossible) I would just try to relax and take yur mind off of it for a bit and see what happens...
