Thanks for your question on Health Care Magic.
I can understand your concern.
Green expectoration is suggestive of
lung infection and
bronchitis.
So better to treat these things first before
pregnancy. It is advisable to be normal when you are conceiving.
So first
consult pulmonologist and get done clinical examination of respiratory system, chest
x ray and PFT (Pulmonary Function Test).
Chest x ray is needed to rule lung infection.
PFT is must for the diagnosis of bronchitis.
You may need Inhaled bronchodilators, inhaled corticosteroid (ICS) and antibiotic drugs.
Don't worry, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.