Aw, ang hirap talaga ng insomnia especially pagbigat na! A few of us went through this around that stage, one friend said parang ang bawat small discomfort (back pain, frequent urination, anxiety) combined talaga ang nagpapagising, then magsisirang ang sleep cycle. Try drinking warm milk or chamomile tea a few hours before bed, and pag gumising ka at hindi makatulog, don't force it, go to another room, read, or do something calm para hindi maging stressful. Since it's been 2 days na, definitely mention it to your OB next visit or even call kasi ang consistent sleep deprivation ay nakaka-affect ng pregnancy, walang masama sa peace of mind eh!