Ok i really need womens' help----?

I have heard of women who go their whole pregnancy without a home pregnancy test showing them as "pregnant." But, since you've gotten a sonogram done, that's probably not the case with you! Being four months late with your period though, is definitely worth a trip to the doctor (as you know). Stress, diet change, extreme weight gain or loss, gland problems (pituitary or hypothalamic), nutrient deficiencies/malnutrition, etc. There are several more, which you can read about at the link below.