[Charnna123]

21/1/2014- I last had a period on 6/1/2014 and had clear blue test on Thursday 16th January which said 1-2 weeks pregnant. I haven't yet had a missed period and had sex on the 19th 22nd 24th and 25th December. I'm confused to when I would have conceived?? Also on the 19th was a different partner

[odinn7]

There's no way to know.

If you're concerned about who the father is, you will need to do a dna test when the baby is born.

[Charnna123]

Really. Wouldn't a scan give me specific date?

[CravenMorhead]

You've had a period this month? On the 6th? Have you had sex with the same partner since?

It is hard to say what day you conceived. There are a lot of factors, how long the sperm lasted, when you ovulated, where the egg was, and when the implantation too place to name a few, and they can have an effect on when your pregnancy started.

If it is a paternity question, unless you've only had ONE partner since your last period, you'll need to wait until you've given birth and have a DNA test.

Really. Wouldn't a scan give me specific date?

The scan dates it but it is difficult to say the exact date. The date calculated is based upon average length and uses that to calculate how old the fetus might be. The problem is that variations, especially when small, can throw the date off in either direction. As well they usually date to the beginning of your last period anyway. Makes things more consistent.

There is about a two week slush on either side of a ultrasound date.

[Charnna123]

Yes my period was on 6th January until 11th January. I had sex with partner on 11th January to

[odinn7]

Oh, now there is more information...you might have wanted to include the January sex in your original question.

Chances are it's the guy you had sex with in January AFTER the period.

[Charnna123]

Oh sorry I didn't think I would detect pregnancy from then so soon