I'd definitely bring this up with your gynae at your next appointment or call the clinic to check in sooner, just to be safe since sharp pelvic pain can sometimes be ligament stretching but it's worth confirming. In the meantime, a lot of mums find that pelvic support belts help take the pressure off when you're walking around, and switching positions regularly at your desk (not staying in one spot too long) makes a real difference. The pillow between your legs is good, but you could also try sleeping on your left side as it takes some load off that area. Many of us found the pain does ease once we know what's causing it and get the right support in place, so hopefully once your PD has a look you'll feel more reassured and can sort out a plan that works for the next few months.