Hi Miklaoz, Glad your feeling better. Wow 13 weeks, time is flying by for you. From what I know of sciatica it is a sharp nerve pinch and can travel down the leg. But that was just my expeience, and everyone is different. Could be that or muscular loosening from changing hormones and body shape and centre of gravity shifting. ???? if its real bad check with doc, or maybe a good masssage will help? Any excuse for a massage...