How To Prevent Miscarriage?

i m 33 yr old female, gone through 2 misscariage in 1and half month each. doctors did nt gave any specific reason except they told hcg and progestrone levels were low. its 1 year now and dr asked me to have folinext and ecosprin 75 for 3 months before conception. i m very afraid in getting pregnant once again after 2 misscariages. plzzzzz help me dr so that this will nt happen again and pls let me know best gynecologist in nashik, maharashtra.