Menstrual changes

Good evening, am new here, I got married last year December. I noticed my period didn’t flow for four days which it used to be before I got married but flowed for two days for two of my cycle, also my cycle changed from 28 days to 26 days. Immediately after the period for February, I was having back pain and lower abdominal pain even till another period also during the period. But this time around it flowed for four days. Please what’s happening to me. I am also having temperature and loss of appetite with the pain

You are undergoing hormonal changes. Pls see a gynaecologist. Get pregnancy test done before any treatment