Brief Answer:
DEPENDS ON FURTHER
FOLLICULAR STUDY.
Detailed Answer:
Hello
Thanks for writing to us with your health concern.
Would you please tell me a bit more about your history - your normal menstrual cycles, duration of menstrual flow and length of cycles, indication for the follicular study being done.
Normally, if your cycles are regular 28 day ones, then ovulation should occur on day 14, at this time, the follicle should measure around 18 -22 mm.
So on day 16, you are slightly late.
THe follicle measuring 18 mm should rupture in a couple of days, the one measuring 15 mm might just regress.
So the chances of twin conception depend on further follicular study.
IF the second follicle also grows serially and ruptures, then chances of a twin conception are pretty high.
Generally, if this is a cycle where you are trying to conceive naturally, again chances of twins are low.
If you have used drugs for stimulation (
clomiphene, gonadotropins ) etc, then chances of twin conception are high .
For one single cycle, there are no known percentages, in conceptions from clomiphene, chances of twinning are as high as 30 %.
Once I know more of your background and the drugs that were used so far, I can give you more exact figures.
All the best.
Please feel free to discuss further.