As your period was on 16th September, and assuming a 28 day cycle then conception would be estimated at 30th September with a window of 26th September to October 4th. So looking at this alone, the intercourse on 28th September was more likely to result in pregnancy.
However you mentioned a missed pill situation, this may change matters.
What pill were you on? When did you start the pack, what tablet did you miss? How many tablets did you miss?
Finally, how do you know you are pregnant at the moment?
Pharmacist
MRPharmS. Worked as Community pharmacist for 16 years. Undertaking a second degree in medicine.
I have been for a blood tests at the hospital and also a internal scan as the doctors first though it was an ectopic pregnancy
I was on the microgynon and forgot to take it a couple of days in Sept whilst on holiday in Mexico. But i continued when i realised i forgot and after my period finished as i normally do
How and why could this affect my ovulation dates?
Missing one or even two microgynon tablets in the middle of a pack may not always result in ovulation. The risk of pregnancy is much higher at the beginning or end of a pack.
If scan has confirmed pregnancy, then hopefully it will also give an approximate age of the embryo, and that is what you need to use when estimating who the father might be.
The problem is that the period you have when on a birth control pill is usually a 'withdrawal bleed' and does not match the normal cycle so making it harder to predict when you ovulated. So it can make matters confusing in cases like yours.
I am approx 6 1/2 weeks pregnant now but the doctors have taken this from the first day of my last period, but last week on the 29th Oct was my last scan and the embyro was around 5mm in size?
Hi there?
Did you get my last reply?
it was the actually embryo crown-rump length
the sac was around 15mm
Thanks for the extra information. The size as of 5mm suggests an embryo just over 6 weeks so allowing for the variation in implantation etc, then this still supports conception around 26th -30th September.
Obviously nature does have variation, but looking at all the information you have given and the accuracy of modern scans then the intercourse on 28th is the most likely time that you conceived.
Thank you so much that really does put my mind at rest!
I have been so worried these past few weeks, which doesnt help when your tired and feeling sick anyway.
I really really appreciate your help!
Many Thanks