Switching birth control and no period?( S.O.S please help)

Sabrina • I love poetry, music, beautiful places and like-minded people. Brice James Poche is my wonderful fiancé.
So I have been taking Lo Loestrin Fe 10 mg. since January but had very irregular periods( one in the beginning of the month and one at the end of the month, but they would occur around the same time every time) and horrible, constant headaches. I went to my female doctor May 19th and told her my symptoms she switched me to Minastrin 20 mg. because of it was too low of a dose for my body. She told me to start the new pack immediately and so I did. I was supposed to start my period May 28th. I had all of my normal symptoms: PMS, breakout and cravings but no bleeding. I took a pregnancy test May 30th and it was negative. I have eight more days on my new pack until the last four pills. Is it normal to start a new pill and have a late/skipped period? Or am I just being paranoid ? Has this happened to any of you ladies? I would really appreciate the advice and help. It would mean a lot if you would comment and help me. Thank you in advanced! 

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