Every few months during the first couple days of my period i experience a gushing of clear fluid. could this be a rupture of a cyst?

Unlikely: Ovarian cyst are usually small in size and does not what you have described. Even big ones will build up and cause trouble in stomach but does not "leak" from vagina

Unlikely: ovarian cysts usually rupture inside of the belly and any fluid is retained there, rather than flowing out of your vagina. the cyst rupture that leads to the release of an egg tends to happen about 14 days after your period or about midcycle, so unlikely w/in the first few days of the period. what you're experiencing sounds fairly normal.