What are the signs of pregnancy?

alright yall so im 6 days late according to my period track app . i took a test sunday, monday and tuesday. all said negative. im so confused. when i was pregnant with my almost 7 month old i got a positive test when i was right around 4 weeks pregnant . the first day of my last period was march 23rd. my cycle between january-february was 38 days and my cycle between february-march was 35. now idk whats going on.my fiance never came in me. but has anyone gotten pregnant with precum? im so lost of whats going on.