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However, implantation cannot take place only a few hours after sex. That takes several days. You are considered fertile on Ovulation Day and the previous 5 days because sperm can live in a woman's body for 5-6 days. So sperm can be waiting in your fallopian tubes for ovulation. After fertilisation, the egg travels to the uterus, where it arrives about 6 days later. Implantation might then take place within the next few days.
The ex-convict drug addict could have infected you. I suggest you have a test for STIs. But why, if you love your soulmate so much, did you have sex with this guy?
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Ultrasounds are usually quite accurate (if observed correctly), whereas a medic's initial early estimation is often based on LMP. That is the only known date and assumes a 28-day cycle.
With a 5-week (rather than 4-week) cycle, the estimation would probably be a week out. The stated 40-week pregnancy is really the time from LMP with a 28-day cycle. In fact, it is 38-weeks from conception (ovulation/fertilisation). So as your cycle is nearer 5 weeks, then the baby's due date would be 41 weeks from LMP.
However, even that does not account for your given dates. It could be that the scan was read wrongly (it has happened) and the due date should have been calculated as later than 15th Dec. Or it could be that you ovulated earlier on that occasion. That sometimes happens too.
You could try a home test that gives an estimated due date as well (like some Clearblue tests do) and see whether it gives a similar result to the scan reading (or not). If that gives a later date, you could see whether you can have the scan reassessed, or have another scan.
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thankyou for your time in responding x
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6th March to 15th April = 30 days.
If your cycle is regularly 30 days, it would suggest your next period would have been due 5th May. That would have meant Ovulation Day (14 days earlier) could have been 21st April (therefore also = Conception Date). Fertile days would then have probably been 16-21 April. That would make you now 4 weeks & 2 days and suggests a due date 12th Jan (38 weeks).
However, calculations are often made from LMP, which adds another fortnight to the length of pregnancy. Clearblue normally indicates from conception: 1-2, 2-3, or 3+ weeks. That would equate to (with a 28-day cycle) 3-4, 4-5, or 5+ weeks from LMP.
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Hi Abby.
From the little you have said, the father is possibly your boyfriend. But you need to be more specific.
- What was the date your last period started? 21 Dec?
- What date did you expect your next period to start?
- How did you calculate that start-date?
- How long is your cycle usually (typically 28 days)?
- How was the "5 mnths pregnant" calculated? Scan?
- How many weeks and days is that? 21 weeks 4 days?
- What date is the baby due?
- How was that date determined? Scan?
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Correction! "6th March to 15th April = 30 days" should have read "6th March to 5th April = 30 days"
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It's OK to ask again. In fact, I mistyped (now corrected) a date. I said "6th March to 15th April = 30 days", and meant to say "6th March to 5th April = 30 days".
- With a period starting 6th March, to be fertile on 4th April would mean a cycle of at least 43 days, or a second ovulation occurring between 4th & 9th April in addition to one on 22nd March.
- The Clearblue tests: 11th indicates fertilisation between 20-27 April; 14 May, between 23-30 April. That is consistent with having a period on 5th April and Ovulation Day (and fertilisation) on about 21st April. That would mean that 11th May could show 2 weeks 6 days; 14th May 3 weeks 2 days. Those are close to the 2-3 weeks shown by Clearblue.
Does this help a bit more?
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