Light Bleeding after sex in early pregnancy!?

Lisa
Hey guys so I just got my BFP a couple days ago, I'm roughly 4 weeks. Last week and then just tonight after sex w my partner ( who is larger) there was a noticeable amount of blood which stops right after. No cramping or  pain but I just want to know if it's safe or if we should chill out til I'm farther? Insight and prayers welcome