pregnant again..

Hi ladies,

I have a son who is just 4 months old and now I feel like I might be pregnant again... I just don't really dare to take a test. I keep putting it off. During my last pregnancy, I had a kind of stabbing sensation, and I'm feeling that again now. I keep telling myself, "Okay, if I still have it tomorrow, I'll get a test." We had one instance of unprotected sex. Are there any other ladies here who got pregnant so quickly? By the way, I've only had one period so far, which was about 2 weeks ago.