Confused about my cycle

Hey everyone, I'm new to glow! I'm a little confused about my cycle and don't know if I should be worried or not. I am normally super regular and my cycles last from 34-35 days, and I ovulate on CD 18 or 19. But for the past 2 cycles they have been 41 days long! And I ovulated on CD 25ish. The first cycles I ovulated really late do to the stress of graduating, but I'm not sure about this cycle. Honestly this whole thing scares me because I'm afraid there's gonna be something wrong with me.. Should I not be worried? Thank you for helping!