What Does Delayed Periods With Pregnancy Symptoms And Negative Result In HPT Suggest?

HI my name is Masha.
My period is three days late, the pregnancy test was negative on the second day my period was due.
Today I started to feel cramps in my belly, my breast are a bit sore, I feel like I want to pee more often, although this feeling coming and fading away on its own (even if I don't use the washroom).
I had 2 miscarriages, last one in May 2014. I also have a 2.5 year old daughter.
My period cycle is 24 days, the first day of the last period was December 12, 2014, the intercourse had place on December 25 and 26, 2014.
Is it still possible I am pregnant? If so why would the test say no as I believe I took it on time.

Thank you!