I did not conceive till three years after marriage. So my Gynaecologist had given me some tablets ( dont remember the name exactly ). She said that it can produce better and stronger eggs. With those tablets I conceived and came to know that there were two sacs during my first scan. Later one of the sacs got dissolved and there was only one baby and the baby was normal. Now after 4 years I conceived again without any tablets i.e. naturally. I am about 40 days pregnant now. Will the same thing happen again, i.e the problem of two sacs or since this is a normal pregnancy everything will be normal?
No, this time most probably you are going to have one sac. Confirm it on USG. You had two sacs earlier because you were on ovulation induction Chat Doctor.  So that time your two eggs got fertilized simultaneously, but unfortunately one got dissolve by itself and that is a normal thing so don't worry.