I neeeed Help!!!!!!!!!!!?

After I bust, I still keep going for a minute-ish or so, maybe less, is that bad? Can like semen spill out and into the girl. Once I pull out there is still hella semen inside the condom so it doesn't seem liked it spilled but still. The girl usually has hella semen all over the place, but it is hers not mine you know, just bodily fluids everywhere. I do this everytime and nothing bad has ever happened but I mean it still seems kinda risky you know? Any advice on what to do once I come, is it ok to keep going for a few? and how do I hold off coming?