Paternity Pickle

I choose Paternity Pickle as a tittle for my question because I read a similar story then mine. Not exact.
PLEASE IT WILL BE VERRY APPRICIATED IF U TAKE THE TIME TO HELP ME!
I am pregnant! Wity my first child im so exited. But ive resently was put in doubt for listening to someone.


Anyway, my Due Date is May,11, 2012
My LMP was august 5, 2011

So calculation shows my
Probable Date of Ovulation: August 19, 2011

Possible dates of Conception: August 15 -- August 23, 2011

Ive always been regular I have to point out that July I had another partner before this relationship im curently in. Ive been completely faithfull to my parner.
I had last had sex with my previous partner maybe around the 22th-23 of july. I got my period that same month as it should be. I get it the same time around everymonth.  July26
Lasted five days as usual Ended completly on the 31of july.

I had sex with my new and only partner ever sense. I had sex with my parner that last day of my period wich is on the 30-31of july
Took plan b for the first time ever. Reason bein he came inside.  Here is were my confusin begins!!!!!!!

Five days later I get my period again! August 5- August 9
Lasts up to 5-6 days same as my regular period had.

Figured first time Ive tryed plan b. First time ive had this happen to me. So I would say it was the side effect of the plan b.  

So im thinking Ita probably the new date for my period I might get it next month around the same time on the 5th or something & if not on the 26 as it should be. If I dont then its a missed period and im PREGNANT! .........
soooo. I waittttt..... Sept 5th passes no period!

I couldnt wait anylonger so before the 26 passed I took a test on the 24 & it was POSSITIVE!!
So I went next month to the doc did an ultrasound & by then I was allready 11weeks exact that day I got the ultrasound.

Wich was: Oct, Friday, 21= 11 weeks
So if u count backwards every friday from this date to the first week its August 12, 2011.
So every friday would be a weeek!

My question is can it really be possible that it was my previous partner that left me pregnant!.
Or is it completly somethin I should not worry about.

HELP! Im sure that its my current partner but someone just put that doubt in my mind.

  

[RockRose]

Calculating backwards from your due date,  you conceived between Aug. 12 and 19,  according to an online calculator.

[CuriouslyJade]

Exactly thats mean is impossible! Rite?!! Just have to clear my mind.

[mum2beagain]

If you had a period, and took plan b and had bleeding again all after the last time you slept with the previous partner then it is not his baby. It is your current partners baby. Good luck with your pregnancy.

[CuriouslyJade]

Thank you so much this brings me peace like u cant imagine. I let a few ppl get in my head. But thank you so much to take time oura your day to write to me! (:
Its very appriciated!!!