I am that person!!
I honestly thought I was into a new cycle after experiencing 4 days of light AF type bleeding.
It was the first time I had used a mooncup so wasn't sure of the flow etc, but it was definitely red but no real clots etc (Sorry for the TMI, but I really feel the need to be specific here)
I was shocked to see AF as I was only 8 dpo and had been spotting brown since 4 or 5dpo but having recently come off BCP I thought it was still messing with my system.
Fast forward a week and a half or so and I wake up on a Sunday morning after having a really vivid pregnancy dream. I got really upset and told DH that if I wasn't going to be pregnant yet I didn't want to have dreams like that.
I had started taking OPKs and tested later that day. I don't know what made me dip the HPT but I did and it came up a blazing + immediately. Cue me in shock then rushing out the door into town to buy FRER and CBD tests to make sure.
Sure enough all the tests I was taking came back positive. I beat the control line on the first response first go and the Clear Blue with conception indicator (I'm in the UK) said I was 2-3 Weeks since conception!!
All in all I took more than 10 tests all positive.
Turns out I had a heavy implanter who took 'his' time to get settled, coupled with a very sensitive cervix.
I'm now almost 13 Weeks and into my second trimester.
There is always hope and it seems that my subconscious knew before I did and made me test that morning.
The only way to know for sure is to test.