I knew with all 3 before tests were even able to pick it up.
With ds1, I was at a bomba dance (think big loud drumbeats) so I started zoning to the music and I literally felt & 'saw' him implant on the lefthand side of my uterus.
With ds2, I started having 'weird' thoughts, like 'I'm wondering if I'm carrying one or two' that made me go 'huh'? lol
With this baby, I just *knew* the moment dh and I had a 'near' oops that turned into an 'oops'.

With all three, I have had the digging in pain that others have felt. Each time, that's where the baby has implanted, according to u/s. With ds1, I told the u/s tech where to go b/c he wasn't seeing anything. Still fiddled around on the opposite area 'just in case'

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With ds2 I felt him implant on the left hand side but in the front of my uterus. U/S tech at the 20 week u/s told me I had an anterior placenta. Big shocker, I know.

Still haven't had an u/s with this one, but I definitely felt it on my right upper side and then a second one on the lower left front side.

No clue why and won't know if what I felt was 'right' for a few more weeks.
Ami