I had my first period on 15th to 22nd of May which is normal for me then I started bleeding again on 2nd June and finished on 20th June. It's now the 14th of July and by my calculations, I was due on the 6th. I have done a home pregnancy kit a few days ago and it was negative. I'm not on birth control and I'm 20 yrs old. Thanks in advance for any replies/comments.