No period after second dose?

I am a 27-year-old female who had my first dose of Novavax on August 13 and my second dose on September 3rd. I usually have periods every 4-5 weeks, maybe up to six every once in a great while if I’m really stressed. After I received my first dose, my period was thrown off. It took an extra three weeks to come (7 weeks between cycles). I had my period when I had the second dose. Since then, I have not had a period. No chance of pregnancy. Stress levels have been normal.

Has this happened to anyone else?