Spotting before period

Jacklyn • Working hard for our first baby.. hope to meet him/her soon....
M just wondering.. bee 8months when i have this changes on my period... at 1st m going to have spotting i tot i my period start but d next day stop.. 2-3days spotting and then it wil stop.. i wil count 3-5days then my period wil start... is it normal?? What does it mean?? What happen on my cycle???