Pregnant after giving birth ?

jade
Hi my baby is 5 weeks old, and me and my partner have had sex, I'm so worried I could be pregnant, but he didn't c😳m in me tho! But they say you could get pregnant from pre-c😳m has this happened to anyone ??? 
And been pregnant ? Think I'm just worring lol but thought I'd ask you all.  thanks ladiesÂ