Help so confused answers plz

Skye

So yesterday I spotted for like 3-4 hours first was tiny spots when I wiped then got a tiny bit heavier but only when I wiped didn't get on pad and after 4 hours bleeding stoped was 10 days after sex and 4 days before due for a period. Could this be implantation? Did a test 3 days ago was negative but was probz early ? So confused any answers would be great right now.