CB Digi with conception date

[DachsandPup]

I know CBD are renowned for being inaccurate, but today it went up to 3+ exactly a week after 2-3. But by my dates I should be 5+5 not 5 weeks, and now I'm worried that my scan next week, theoretically after 6 weeks so I can see a heartbeat, I won't be far enough along to see anything. So please can someone reassure me that cbd is a load of rubbish and I shouldn't panic?

The CBD is right as it tells you from the date of conception rather than the 'official' start of pregnancy, which is the first day of LMP. If CBD says 3+ then you are actually 5+ in official terms so no need to panic.

Ah, sorry,I wasn't being clear. By my dates I'm 5+5. But if cbd has only just turned to 3+ today, it thinks I'm 5 weeks today not 5+5, so I'm nearly a week behind according to cbd. And my scan is on Wednesday, when I should be 6+2. If I'm really only 5+4 I won't see a heartbeat...

Yep it's just about the difference between the CBD - tells you how long since conception - and medical definition of pregnancy (counts the 2 weeks before you conceived). The CBD doesn't go any higher than 3+ so it and your dates are right. I would recommend as someone who had to do this myself! that you step away from the tests now and wait for your scan. Hoping its good news :)

I'd rebook, book it for 7 weeks, then you will have a good chance of seeing a HB and not scaring yourself. Any reason for going for an early scan?

have had mmc before and this is a surprise pg so want a scan as early as poss to see whether there's actually a real baby there! want to get excited but can't let myself yet

CB digi can't be exactly accurate as HCG levels vary from person to person. Mine didn't go to 3+ until 5+5 (by LMP) and that was 9 days after it had gone to 2-3. I was scanned yesterday and all is well. I am 7+1, so would have actually been 5+3 when the CB digi changed.

I have had miscarriages and also lots of early scans. Deciding to wait until 7+1 to get scanned was agony, but having been scanned too early before and not seen a heartbeat yet as it was too early, I really didnt want to go through that again, it's awful. I would personally suggest waiting until a bit later for the scan.