I agree about the sickness. Although I am finding it mildly reasurring, this is Dc3 for me and my 4th pg.
With DS1 I felt mildly sick occasionally, with DS2 I had no pg symptoms at all, no sickness, no tingly boobs, nothing, but he was clearly absolutely fine.
Before the miscarriage, I felt very mildly sick on one day only but this time I seem to feel sick a lot, randomly at any time of the day or night. My boobs have grown too which they never did before.
So who knows - perhaps it's twins!