I have heard from my family that inhaling steam with a drop of eucalyptus oil is very soothing for sinus. Please take care of yourself gently and rest well.
Sinus headaches can be so painful and frustrating during this time. I had a tough time with my PCOS pregnancy and avoided all pills. Try warm steam inhalation and a hot compress on your forehead, it really helps safely.
Sinus headaches are very common due to hormonal nasal congestion. Use a saline nasal spray, drink lots of warm fluids, and do regular steam inhalation. Avoid taking painkillers without asking your doctor first.