So when do you think my period will arrive?? ?

Ok well I had my first period in Jan, second in feb, but no third YET. The past 4 days I've been experiencing some heavy gooey, stringy, stretchy clear discharge that comes out in globs or strings ( tmi ik ). I've also experienced some intense cramps, but they only last a few minutes. My lower back is also aching. I just got my period in Jan, so I understand that it's going to be slightly irregular, but how kong shoul I have these symptoms before my actual period comes around?