mini pull birth control question!

Madison
Okay I've been taking the mini pill for like a month and a half. There is one time I missed a complete week because my mom was put in the hospital and it just slipped my mind and then another time I missed 1 day. But then I made sure to take it as soon as I could. And I've been taking it regularly for atleast 2 and a half weeks now. And I've had a period 2 weeks apart from each other but very short periods? Is that normal? And also I've been feeling a little dizzy!! I'm also worried that I could be pregnant because the mini pill isn't very affective so someone tell me their experience with the mini pill?!