2 day period? ?

Hi ladies not sure what to think here. So this app was saying AF was due October 19th & Ovia Fertility app was say October 16th. On October 13th i had light pink spotting then on the 14th i got the heaviest period ive ever had and the 15th also. Like a lot of clots and large amounts coming out at once. Today October 16th i have brown light spotting like the end of a period. Now i googled " 2 day heavy period " & a lot of women are saying they were pregnant. Not sure what to think. My periods are always 4 days of medium to heavy then 1-3 days of brown spotting. Has anyone had this and been pregnant?