confused

so im 17 days late my other app says i should be in ovulation week again ive been taking tests and all negative so far but i still have hope i am i feel like i have symptoms my main symptom is white milky discharge and my cervix is high iv lost appetite im tierd all the time and i have no signs of af i have these dull cranps in my back and lower part tummy that go away and thats it nothing to think periods comming.. my question is how late did some of u girls find out u was pregnant