Should I test? Implantation bleeding?

I am currently 9dpo and have had a sex on the day of my ovulation and after. I need to know if I should test for pregnancy or not but this is a little of what I have right now:

Yesterday I bled a little heavier but only for an hour and it was more brown with little clots. I did not use protection but I am fine with pregnancy. As for some other things I've had different symptoms than ever really, like hot flashes or being as nauseous as I am/dizzy. There is truly a lot.. any ideas? Is this implantation bleeding? Should I buy a test?

I'm not die for my period until the eighth.. but I have a feeling I'm pregnant...