Another negative, please give me hope!!

9DPO, so stupidly I used a first response early results test … negative of course. I now feel crap, like I’m out this month and definitely not pregnant as there wasn’t even a faint line. Could there still be a chance I’m pregnant?? We had sex before, on and after my suspected ovulation peak and other times throughout the same week. From reading on implantation that will likely happen tomorrow if my ovulation dates are correct, meaning I should test in 3 days time, 48 hours after implantation, when I’m 12DPO? Help please I feel crappy!