Since it has not ruptured even with 5000 IU of HCG you need a repeat HCG 5000IU again
Next Steps
Check out the expiry date and cold chain maintainence of previously given HCG injection
Health Tips
Take HCG 5000 IU and repeat scan after 2 days to document ruptured follicle. If still not ruptured it is luteinised unruptured follicle