HCG positive but Clearblue decreasing

By right I'm 5 weeks at the moment.. 2 weeks ago Clearblue indicated 1-2 weeks. A week later my hcg blood test showed 288.9mIU/ml and Clearblue indicated 2-3 weeks. Another week has gone by now and Clearblue is showing 1-2 week instead of the 3+ sign. Even the other test kits are showing faint lines now when all along they have all been darker and progressive the past weeks. I'm so confused. My gynae appt will only be next week. I'm extremely worried about this. Anyone out there experiencing this or have experience before? #pleasehelp #advicepls