Super long cycle..

Anyone else have super long cycles? I've never been "regular" but I always freak out when my cycle is longer than 35 days (my average cycle is 32 days).

I'm currently on my 44th day, and there is no way I'm pregnant cause I'm still a virgin...

Could it just be stress and sleeping habits throwing me off? I'm starting my 4th year of college in a week and stressing about my classes, and I've been going to sleep around 3am and waking up around 1-2pm. I also live with my two sisters who were both a week late this month, could our cycles be throwing each other off?