I am trying to figure out when I actually got pregnant because I am really not sure of exactly when it happened although I did chart all events.

This is complicated because I got pregnant the first month I went off of birth control and did not give my body a chance to stabilize. That means that my cycle could have been 4 weeks, 6 weeks, etc . . . and I am not sure.

Timing details are as follows:

8/17 Last Birth Control Pill Taken

8/19 Started TOM Cycle

8/21 Finished TOM Cycle

9/15 Negative Pregnancy Test

9/18 Negative Pregnancy Test

9/21 Negative Pregnancy Test

9/22-9/23 Bad Cramping (Maybe Implantation???)

9/25 Negative Pregnancy Test

9/27 Extremely Faint Positive Pregnancy Test

9/28 Very Faint Positive Pregnancy Test

9/30 Moderate Positive Pregnancy Test

10/2 Distinct Positive Pregnancy Test

So what is your guess as to when I most likely conceived???

I came up with a chart of potential dates, but I am not sure if it is realistic.

Week Week Week

Start --- Finish --- Number

8-Sep --- 14-Sep --- 1

15-Sep --- 21-Sep --- 2

22-Sep --- 28-Sep --- 3

29-Sep --- 5-Oct --- 4

6-Oct --- 12-Oct --- 5

13-Oct --- 19-Oct --- 6

20-Oct --- 26-Oct --- 7

27-Oct --- 2-Nov --- 8

3-Nov --- 9-Nov --- 9

10-Nov --- 16-Nov --- 10

17-Nov --- 23-Nov --- 11

24-Nov --- 30-Nov --- 12

1-Dec --- 7-Dec --- 13

8-Dec --- 14-Dec --- 14

15-Dec --- 21-Dec --- 15

22-Dec --- 28-Dec --- 16

29-Dec --- 4-Jan --- 17

5-Jan --- 11-Jan --- 18

12-Jan --- 18-Jan --- 19

19-Jan --- 25-Jan --- 20

26-Jan --- 1-Feb --- 21

2-Feb --- 8-Feb --- 22

9-Feb --- 15-Feb --- 23

16-Feb --- 22-Feb --- 24

23-Feb --- 1-Mar --- 25

2-Mar --- 8-Mar --- 26

9-Mar --- 15-Mar --- 27

16-Mar --- 22-Mar --- 28

23-Mar --- 29-Mar --- 29

30-Mar --- 5-Apr --- 30

6-Apr --- 12-Apr --- 31

13-Apr --- 19-Apr --- 32

20-Apr --- 26-Apr --- 33

27-Apr --- 3-May --- 34

4-May --- 10-May --- 35

11-May --- 17-May --- 36

18-May --- 24-May --- 37

25-May --- 31-May --- 38

1-Jun --- 7-Jun --- 39

8-Jun --- 14-Jun --- 40

Your thoughts? I still have a few weeks before I will see my doctor to get his input . . . but I am very eager to figure out timing, lol.

Edited October 2, 200817 yr by HeatherO

I can't help you the least bit with all those calculations Heather, but CONGRATULATIONS! That's so exciting!

Use the online due date calculators. You enter the first date of your last period.

Besides that, if anything else is different (when you actually ovulated, since you think your cycle is out of whack) there's really no telling.

Your first ultrasound, they will be able to know based on size of the baby.

According to one calculator, based on the first date of your last period, due date is:

Your baby will be born on or around Tuesday, May 26, 2009.

You are about 6 weeks pregnant.

Have you called to make your first appt? My doc doesn't see the patient till they're about 8-12 weeks along.

Congratulations!!

With my oldest son, I just knew I was pregnant, although I failed two or three home pregnancy tests. I went to the doctor for a blood test (I was that sure), and I had been pregnant all along. So, like FairyFacade said, for now, you can only go by your last period to guesstimate your due date.

I initially went by the 1st date of last period, but it was changed at my initial appointment based on ultrasound... (I was moved back 1 week 4 days). right now, I'd suggest go by LMP, but be prepared for it to change.

I am so happy for you!!

I'm pretty much just lost looking through that list of numbers, but calculate it based on the first day of your last period. That's what usually gives the docs the initial due date estimate, and no matter what US or anything else indicates, the first due date is what they use to center your care (or that's the rule at my OB anyway, even though US were -6 days). I'm horrible at tracking my weeks so whenever I need to know I use the calendar at pregnancy.org. Using my last known period it's within one day (the difference comes from its accounting for cycle length) of the date my OB gave me, and is within 5 days of "all the other" dates I've gotten since.