Walmart cheapie- when to test?

Hey ladies! I'm new to this board. I'm currently CD20- 7DPO. Many symptoms! These few biggest of which are headaches, sleepiness and frequent trips to the bathroom lol. I also swear I felt implantation on 6dpo with cramps and sharp pains on my left side that lasted a bit more than a day. DH swears I'm pregnant lol. So he went and got me my favorite test the Walmart cheapie. But I told him it's too early! When's the earliest you got your bfp with the Walmart cheapie? I'm trying to wait until Tuesday (11dpo) to test. Help?