Leaking?

I am 30 weeks and this morning i just felt a little wet so i went bathroom and saw i was leaking....pee? Thats what it looks like... yellow so i think pee? Is that normal? I only heard you leak after birth, someone told me your vagina doesnt work normal again like before and sometimes you leak when you laugh or yawn... but i never give birth yet so idk... i changed my liner and see if still leaking, but in the meantime i just wonder if anyone has experienced something similar?