Freaking out

So… I had sex with my sons father 1 time 5 years ago, and that is the time my son was conceived. I then went 4.5 years with out him in our lives. My son met him in November and they have developed a fantastic relationship. We have become friends and are able to coparent well.

3 weeks ago we took our son to the fair, and since it was late we ended up sleeping at his house. Yes, we had sex… he pulled out, but it was on my most fertile day.

Now I’m sitting here with my period 6 days late.

However, 2 pregnancy tests have said negative.

Is it possible it was a bad batch?

Is it to soon?

I’m freaking out!!