Prolonged Period after going off Birth Control?

I was on Yasmin for 7 months, to regulate my periods, because I have always had a heavy period, but after 7 months I opted to stop and see how my body would readjust back. After I stopped taking them I realized I shouldn't have due to an upcoming trip where I know I will be having sex with my boyfriend, more often than not, and decided to get back on it. Being young I suppose, my period after a month off birth control came without any hitch, besides it starting a few days later and I started back on the birth control. However, I have been bleeding for 12 days so far and there seems to be no stopping it. I am already halfway through my pack of Yasmin this month and it has yet to stop. It's not an extremely heavy flow, stopped being heavy after day 4, but it alternates between moderate and light and has been accompanied by slight cramping and pain. I am not sure if I should even give myself the 7 days for withdrawal bleeding or just continue on. I have read it's normal to have a prolonged/irregular period after stopping birth control pills, but wanted to know if it would be a better option to continue a new pack without the 7 day rest period or still give those 7 days to my body and continue on with the pill afterwards. I am just afraid that come my trip I will still be having prolonged periods even if back on the pill.