Not much sperm?

Hey y’all so I’ve been noticing that when my bf and I have sex and he finishes, not much sperm comes out? And it kinda varies like sometimes a good amount will come out and then most of the time it’s like some droplets and I was just wondering what this could mean or indicate. I don’t wanna bring this up to him cause I don’t know if it’s something he’s worried/insecure about himself but Im worried if this could mean issues in the future if we decide to have kids or something:/