Ladies..I need help. 6 months pp. chance of pregnancy?

Ladies... I feel a little bit silly.. I mean I'm married, Me and my husband have a 6 month old little girl and I feel so confused. Let me explain, tonight me and my husband decided to have sex..tmi. We rarely have the time for it anymore. Well, I got off my period 2 weeks ago. And I recently started a new brand of birth control 4 days ago. Well we had sex for a while without a condom ( after we got finished he told me there was a lot of pre cum) and then put a condom on and then he didn't like it( I mean we're married, we never use condoms because I'm always on the pill) so he took it off and then he said he pulled out. So were both just racking our brains on what's our chances of getting pregnant and when I should test. We want more kids... we just wanted to spoil our little girl for as long as possible. So ladies.. be honest... what do I do?