I'm 29 weeks with DC2 and the last couple of days I've been hurting/aching where the leg joins the body (IYSWIM).
It's a kind of ache, something I'd expect if I'd been doing lots of stretching (say yoga or gymnastics) the night before, except that I haven't.
This morning I also had a dull ache sort of in the pubic bone area (vague I know!)
I don't know if it's just ordinary aches and pains of being pregnant or if it could be the beginning of SPD.