Spd???

Hi, I’m pregnant with my third baby and my previous two pregnancies with my daughters I got SPD both times before I was 12 weeks however this time ( I’m 12 weeks ) I have no SPD. I’m not complaining, if anything I’m just a bit worried that I haven’t got it yet as I was always told it gets worse and you get it sooner with every pregnancy. Any one else have it with previous pregnancies and then not with other pregnancies? I don’t have my dating scan until next week so just feeling a bit anxious.