I am trying to get pregnant for the last 3 days he has be ejaculating in me how long before I become pregnant

Are you in anyway charting or keeping track of your cycle? With Temps, CM checks, cervix, OPK's, a monitor, fertility watch or a ferning scope?

If so where are you in in your cycle?

The longer you are on this journey the more you realize that the "28 day cycle, CD14 ovulation" standard that they have out there isn't the norm-

 many women don't even fit into that particular mold even if they do indeed have 28 day cycles. 

They could have a short follicular phase (the time from first bleed to ovulation) with a long luteal phase (AKA the TWW..ASA "LP).  Others my ovulate later and have either a shorter LP (like 12 or 13 days) or even have a luteal phase defect (LPD- which means less than 10-12 days).

I would suggest you chart- they sell BBT's at walgreens near the pharmacy counter (it has a pink cap and goes two decimal places rather than one).  I would suggest going to tyoyf.com.  There is a one time fee for the charting and all the support behind it. 

You can do free charting at fertilityfriend.com but to access the boards you have to keep renewing your subscription.

This will help you to find out what is YOUR 'normal'. 

Ohh and if you haven't read "taking charge of your fertility" by Toni  Wescher I would highly recommend it! I wish I had access to this book when I had my first period!

Til then... on my blog I have a couple of informational pages in the side bar under " TTC Basic Info" where I have put down basic terminology, suppliments, and a listing of different "tools" used in determining fertility. 

Sorry this is so long :)