Hallow Dear,
Since about a month after the previous 
miscarriage you had stopped lactating completely, and now for last few days you have again started lactating after a gap of about an year or so, this 
lactation is not related to the 
pregnancy which you aborted. 
Lactation or milk production (Galactorrhoea) in the breasts is a result of increase in the hormone called prolactin. Prolactin is produced by a ductless gland Pituitary. Please get your blood examined for Prolactin levels. If they are raised (>20 ng/ml) it indicates that you have got 
hyperprolactinaemia. This will cause milk secretions. Such conditions interferes egg formation and hence conception. 
If there is hyperprolactinaemia, you will be advised to undergo X-ray of the skull to find out whether you have any tumour in the Pituitary. Small tumours and  Prolactin levels upto 50 ng/ml can be managed by medicines. Large Pituitary tumours raising the Prolactin levels more than 100 ng/ml in the absence of pregnancy may need 
surgical treatment. 
Are you any medicines? Certain medicines (
methyldopa, opioids, antipsychotics, serotonin reuptake inhibitors, as well as licorice and other medicines) are responsible to cause milk secretions. Behavioural causes (stress, and breast and chest wall stimulation) also can cause milk secretion.  
Thyroid dysfunction also may result in milk formation. So please get your blood examined for T3, T4 & TSH. 
Depending up on the cause, you may require treatment. 
Please report to your Gynaecologist for investigations and follow up. 
I hope this helps you today. 
Dr. Nishikant