Implantation bleed? 7 DPO

Olga
So my ovulation day was 20th i guess as it said 30% chance and 28 i get pink spotting when i wiped in the morning only, then brown spotting, today i got brown when i wipe only. My period is supposed to start 04.02! So i wil be 4 days before my period tomorrow morning, want to test! I got a clearblue digital, can i?