IVF Due Date
Calculating your due date after getting pregnant through IVF is done a little differently than it would have been if you had conceived naturally. Basically, you should count 266 days (38 weeks) from the date that the eggs were removed from your ovaries and fertilised.
The day of fertilisation is treated as the 14th day of a natural menstrual cycle. This gives you a total of 40 weeks. Usually, the due date of a natural pregnancy is calculated as 40 weeks from the first day of the last menstrual period.
If you do get your period within 14 days of embryo transfer or you have a negative pregnancy test confirmed by your fertility doctor, you are, of course, going to be very disappointed.
Fertility clinics in the UK will provide support and counseling for couples going through the IVF process. Remember that this may not necessarily be your last attempt at IVF, depending on your financial resources, the NHS coverage for IVF in your area, or the number of IVF cycles you've already had.
Even when IVF fails, as it does for some couples, there are still other methods of becoming parents available to you.