chlamydia..?

Hey.

I’m currently 16 years old, me and my girlfriend have been together for about 5 months now.

Her sister recently got tested for chlamydia, and she decided she would too just because she’s sexually active.

She has it(she got it from someone she messed with previously). And she thinks she gave it to me, (I’ve never given her oral, she likes to be the top.) which is why I’m not too sure, and If I tell my mom that I’ve been doing stuff like that she’d kill me.

My moms very Christian, she knows I’m dating her but not that we’re sexually active.

So I don’t know how I could get tested , or if it’s even possible to get it through oral? Please help.