8 Days DPO still hope?

When are you supposed to test? I’m 8 days DPO and I had a negative strip test this morning but I know those aren’t always trustworthy? I’ve seen some people get positives this early so Im a little sad to not have the positive yet but could I still be? Also, is it even likely to happen at all if we only “did the deed” 3 days before ovulation..? Thank you in advance!