I am 3 days late bad cramping no period cervix is high and soft with mucus. 2 negative pregnancy test. but i am never late idk what's going on?

Retest in 4-5 days: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two weeks for the embryo to make enough HCG to produce a positive pregnancy test. Use first morning urine and follow instructions for the test carefully. If the test is negative at 7-10 days after a missed period, you are not likely to be pregnant.