Big Question

Hey ladies big question for yall I had brown spotting last Tuesday it only lasted about 3 hours and never went on my pad only when I went potty. My period was due on the 18th so I took a test today not with FMU and it came out negative. So my question is if the brown spotting was immplantaion is it still to early to test. And my other question was it immplantaion bleeding????