who is the father

[kena2015]

I had sex with my previous BF on November 23rd 2012 semi protected (pull out before discharge) and then I had sex with my current BF on 26th Novemebr 2012 and after that so many time till the end of the January when i found I was pregnant. after an ultrasound (January last week or February 1st week) Doctor gave me the Due date on 20th September 2013. but a baby boy was born on 10th September 2013. a slightly doubt was in my mind that my baby could be from my previous BF (23rd November) which often get me worried and embarrassed. actually the scenario is
1. I accidentally lost all papers related to ultrasound.
2. now I couldn't remember all  about my LMP. on hospital's discharge slip, it is 8th Nov, 2012. and 37 week baby on discharge paper.
3.it was a normal delivery.
4. with my current BF, it was all semi protected (pull out on discharge) or protected.
can we completely ruled out 23rd Nov. pregnancy on the basis of above dates and conditions?

[kena2015]

Hi Annie thanks for your master opinion. i always found your comments here on forum, very helpful & convincing.

[PreguntonaPensativa]

I have not checked your dates...but they are not too far apart...but just wanted to add i got pregnant from precum...30 seconds approximately so i found out the pullout method does not always work in preventing pregnancy.