Does it feel like cramps? Ordinarily, I would say that sounds like SPD, but 8 weeks is pretty early. It's not usually something you get until early 2nd tri at the earliest. Have you had round ligament pains before? Those tend to be more on either side of the pubic bone rather than in the centre. You tend to get them when you stand up or move quickly, not all the time. For me, my SPD (which started at 16 weeks last time) was more when I went upstairs or rolled over in bed. When do you tend to get it? It's possible it's just stretching pain, which happens as your uterus grows and your pelvis starts to expend. I had a bit of that this past weekend.