HELP!!!!

ItziaMia
So, I've been expirencing clear watery discharge. Almost as if I poured water all over my panties and my lower tummy area has been pretty bloated and it seems as if it keeps getting bigger, this has been   happening for about 12 weeks now.  I'm also experiencing lots of lower back pain. What could be happening?  I'm a bit worried honestly. Please help ASAP I'm only 17.