I've been very light on the symptom-front. I had one day of sore boobs that was very early on, no sickness at all (but nausea), but I did/do have extreme tiredness.
I did six pregnancy tests in 9 weeks, cost me a fortune!
I drove myself silly worry about all the symptoms I should have had, so much so I booked a private scan at 9weeks just to check (all was ok).
At 10wks felt absolutely normal, so started thinking something had gone wrong, but all was present and correct at 12wks scan. :o I'm 15+1 now.
I am still really tired all the time, and also suffer loads from bloating and constipation, so these are more than making up for the lack of sore boobs and sickness.
I did notice a weird sense of smell and had mad dreams, I didn't realise these were symptoms for a while, and my nails grew lovely - they've never been so long and strong, apparently that's another side-effect.
So even if you don't have the 'big' symptoms, you might have a few other indicators that you maybe haven't realised? :)
Congrats and good luck for your scan x x