Sticky white substance when aroused. Std?

When I'm aroused my penis discharges a white sticky liquid. I'm not sure if its pre-cum because it's quite a bit and frequent . I've had unprotected sex like 2 months ago. Is this normal? It's new to me because I've never seen my penis discharge this much liquid. It's only when I'm aroused. Should I be concerned about gonorrhea or chlamydia?