Sex help: What happened?

Hi ladies, 
So two nights ago my boyfriend and I had sex. All was well and I made sure that he wore a condom. About five minutes in, we both noticed that the base of his penis was super wet, which I just assumed it was from me. So he changed condoms just to be safe and we continued on. 
The next day when we woke up, I made sure to bring it up and ask him if he thought that I should be going out and getting an emergency contraceptive, but he told me that he thought everything was fine. (I am not on birth control so things like this sometimes worry me!)
What are your takes on this? 
Thanks in advance ladies!