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Pregnancy Due date calculator for IVF and Natural Conception
Congratulation you’re pregnant!!!! Or maybe you’re just like us and when you were trying to concieve or going through IVF you would use it to work out when the due date; either way you can use our due date calculator to mark the big day in your diary. It also considers the due date for those with the ‘non’ standard 28 day cycle that every other due date calculator seems to assume we have.
The Natural and IVF Pregnancy due date calculator
Here’s what you came for the calculator. Select your calculation method, cycle length imput a date then chuck the big day in your dairy.
How does the due date calculator work?
First day of last period
The majority of pregnancies are 40 weeks long taken from the date of the first day of your last period (or 38 weeks from conception). Simply the calculator adds 280 days. The variation for your cycle allows this to be adjusted based on your likely time of ovulation.
Another way to do it and the way that a lot of doctors do it quickly in their heads is to subtract three months from the first day of your last period and add seven days For example if your last period started on November 17th , you would take off 3 months to August 17th and then add seven days, which means your due date would be August 24th.
The calculator uses 266 days from date of conception – this is as your practitioner would do if you chose a date based on conception/ovulation. This works because your egg needs to be fertilised within 48 hours of ovulation. This method can be useful for women with irregular cycles who know use basal body temperature, core body temperature or opk’s to know when they ovulated in the cycle they successfully got pregnant.
IVF transfer date
If you have had IVF, you can calculate your due date more precisely using your IVF transfer date. Which is included in this calculator. However please remember your due date even one through IVF can change and we will discuss that below
Can my Due date be changes?
The simple answer is yes!
Did you know that only 1 in 20 babies are born on their due date and only 1 in 3 in their birth week! It’s nuts; to further illustrate the point, if two women are given the same due date there is a 1 in 500 chance they will both have their baby that day, however there is only a 1 in 30 chance that they will have their babies on the same random day.
Statistics can show some funny things!
But back to the point, there is one main reason why your due date can change.
In your 12-week ultrasound scan they do a measurement of your fetus by the crown to rump length. They then turn this into a gestational time, which can change your official due date. In fact, this happened to us during our successful IVF cycle. We had the date from our 5-day transfer then on our ultrasound our baby was dated 2 days behind. This is nothing to worry about and happens to a lot of people.
Does having a multiple pregnancy affect my due date?
The formal answer is NO…. however it does have an impact on when you are likely to deliver.
The average gestational age for multiples are the following
Twins | 35 Weeks
Triplets | 32 Weeks
Quadruplets | 30 Weeks
Quintuplets of more | 27 Weeks
The main reasons for the earlier delivery is that multiple pregnancies come with higher risks, as such the instance of pre-term labour and medical interventions for pregnancy complications including preeclampsia, growth restrictions and placental abruptions is higher. However it’s important to note that a multiple pregnancy does not mean that you should have an earlier due date – A full term pregnanctyis still 37 weeks as with a singleton.
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