Hi Roja ,
You don't need to panic. you are in the age of high chance for
pregnancy.
You are slightly
overweight. Your weight should be Height in cms - 100
I mean 5 ft= 152-100= 52 kg
This is reason for PCO & difficulty in pregnancy.
Try to reduce the fat around mid segment of body. No fasting. Have controlled diet regularly with low calories, no junk food. Regular exercise , especially for the waist , thighs & mid segment of body. take your time . If you get pregnant with fat, chances of pregnancy complications are also high.
Once you lose weight , your periods will also be regular with good flow
( normal flow) & you may get pregnant even without medications.
Inj
HCG is hormone which causes your follicle to rupture & egg is pushed out. Usually 13-15 day of cycle follicle will be ripe to rupture, hence doc has give you that injection.
Have faith in God , you will get pregnant when right time comes
All the best
Dr.Balakrishnan