well this is how moms think, having a child at your age, they think that their child is unsure and think it is a phase. and they will grow out of it. But parents should always take their childern seriously on any subjuect
hum? denial may be a coping mechanism for her. maybe u are the only girl, and U will never become pregnant, she won't be grandma. she may be thinking, "there goes the neighborhood or family?"
Then she does not accept your lifestyle or choice in romantic relations. She is ashamed of you, not as a whole, but in this respect. It goes against her morals and she does not wish for you to have such a lifestyle, therefore she denies it.
She can deny all she wants...she knows the truth and so do you...I wouldn't care.
Whys it your mums bizz?