Question about EDD

**newmummy** · February 23rd, 2010, 08:49 PM

I just got my positive HPT this morning. Am planning on doing another one tomorrow just to make sure.

What I wanted to ask is how do you find out your EDD? I know that people have said to calculate from your last period. The problem I have is that I have PCOS, and had only just started getting a regularish cycle at the end of last year. I thought nothing of not getting my period in Jan (even though I did a test and it came back negative). But this time it came back positive.

If I did from my last period, then I would be 8 weeks and 5 days pregnant. WHich is fine if I am, but what if Im only 4 weeks pregnant? Will it matter if I book it in with and EDD of September sometime, and then get it changed to October? Or should I wait until I get blood tests/ultrasounds to get a more concrete idea.

I feel a little overwhelmed by all this at the moment, and just need some advice.

Thanks

**beckoes** · February 23rd, 2010, 08:58 PM

First of all, welcome to BB, Secondly, congrats on your pregnancy. And third, i had a similar problem, i had no idea when my period was before i got pregnant so my GP sent me for a dating scan which gave us the EDD. they seem to like to change the EDD at each scan you go to but you should stick with the first scans dates as they are the most accurate.
Good luck and congrats again!!!

**[M]umma[M]ia** · February 23rd, 2010, 08:59 PM

You wont know too much until you go for a dating scan.... congrats on your pregnancy!!!

**~Gee_Whizzy~** · February 23rd, 2010, 08:59 PM

Firstly, congratulations on your +HPT!

in regard to the EDD, yes its taken from your last period....maybe the best thing to do would be to make an appt with your GP and request a dating scan that way you will know exactly how far along you are

**Nelle** · February 23rd, 2010, 09:02 PM

Do you have any idea of when you ovulated, or when you might have conceived?

The BB due date calculator lets you change your cycle length and luteal phase (when you ovulate) if that helps at all.

Generally, I'd be going with the later date to avoid induction at the end, but I think a month is a pretty big discrepancy to have, because it means you could be way out with your 12ish week scan to check the nuchal fold. You might want to have a dating scan, or a blood test to give a better idea.

Congratulations, by the way!

**TeniBear** · February 23rd, 2010, 09:36 PM

I have very irregular periods myself (no known cause, just seems to be "one of those things") so I had no idea when I had my last period - they booked me in for a dating scan but I ended up going for an emergency one a few days before that because of a suspected ectopic. They were more thorough (internal when they had a hard time seeing from the external)

That one gave me the EDD of April 23rd, and when I went along for my original dating appointment that tech said it was more like May 10th. The April one was right going by all further scans I've had

In fact, all of the others I've had have never been more than two days off for all the measurements!

So my advice would be to ask for an internal check if you're up for it. It was so much more accurate for me, and I even got to see Smudge's heartbeat that early on - apparently it was the earliest the tech had ever seen a heartbeat

I grow strong babies, apparently

**newmummy** · February 24th, 2010, 05:31 AM

Thank you so much everyone.

Im off to the doctors tomorrow to find get the blood test, and try to get a dating scan.

Ihave another question, I keep getting these dull pains around my waist area. They usually last for less than a second, but I get them on both the left and right side. I am going to talk to the doctor tomorrow about them, but was hoping someone would be able to tell me what they might be.