Reasons for late / missed period?

Asked: Reasons for late / missed period?I am going to my doctor this weekend but I want to get some ideas before I go.My last period came on 28 May so hmm today is 26 July and I still haven't have it yet. I was wondering why? What are some possible reasons?I have the same lifestyle, diet, stress (not too much) throughout the year, I never had a missed period before, well maybe once... I don't see any changes in my body, just my skin got worse, so much acne lately. Also, I don't think I could be prego, I had genital contact with my man in the past 5 months, he ejaculate

acne