Is It Mine If She Is?

Hello,
Me and my girlfriend broke up 4 months ago (August).  The last time we had sex was on the 7th of August.  Since then I asked her to take a few pregnancy tests (all of which came out negative), she got checked out by the OBGYN in October (the doctor said she was not pregnant), she took a blood test (which came out negative) and she got her period 4 times, on time, for the last 4 months (all of which came on a 28 day cycle and lasted for 5 days).  She started taking birth control again on the 23 of October.  She had sex on Nov. 29 with a new guy and thinks she may be pregnant.  She is nausceous and says she feels sick?  I think it may be the birth control pills since she skipped a few days but then doubled up on them?  The question I am asking is, what are the chances that it is mine if she is pregnant?  I do not think so, but I am a little concerned?  Someone please answer?  

[Skylynns_mom]

Slim to none. more like 1 in 200,000,000.

[tarajanes]

Dont worry no chance its yours..

[beautifullychaotic]

Dont let her fool you into this.  It cant be yours!

[wannabamommy]

There is no way its yours. She probably is just nasuseated from the pill b/c starting up on them again can do that to you for a few months. It did to me. It's one of the side effects. Besides its a little soon for pregnancy symptoms.