Girls, I'm in shock here... I'm 37.5 weeks pregnant, have some watery …

Girls, I'm in shock here... I'm 37.5 weeks pregnant, have some watery discharge, not sure if it's leaking water or maybe urine is coming out, I don't know... I wanted to buy a test for fetal fluid leakage, but there's none in stock at pharmacies, and even some don't know what it is ? And I thought about ordering online, like apteka.ru and all that, but it costs a fortune ? Has anyone bought one before? How much did you pay? Is this a normal price for this test?