Missed period

Ok so Iv been missing my period for the first time , I have nevered skipped a period in my life not even when I was pregnant I had my period for seven days heavy flow and really bad cramps and then found out. I was 2 weeks after my period but in December of 2018 I had a miscarriage , so I got my period regular till March I skipped it , took a pt and negative, April came got my period super light . And then may June July got back to normal here comes August and I skipped it again . Still negative . I really don’t know what going on with my body. And it’s really not normal for me . This year is the first year that I’ve skipped my period 2 times already