Missed period

I haven’t got my period for the month of January and I’m usually not late except the time I found out I was pregnant Nd then I had a miscarriage in April of 2017 then may I didn’t get one either then November I didn’t get one but December I did I got 2 actually well I think I did cause one on the 6th then another on the 31st but the one on the 31st I had really bad lower back Nd stomach pains Nd felt nauseous a lot Nd the bleeding was very light Nd short Nd January I haven’t receive a period but I been getting headaches Nd feeling nausea a lot but haven’t threw up yet

anyone have any ideas