Good morning I am new here. I am pregnant but if I go for a test they …

Good morning I am new here. I am pregnant but if I go for a test they will say it's negative and I have all the signs of pregnancy and my period comes earlier than the date it's supposed to come,like December it came out 17th and this month January it came out 10th which is not supposed to be. Am I really pregnant or something is wrong?