I had only little periods in the last month.26th dec and 27th just spotting and on 28th and 29 th little bleeding.I took pregnancy test it was negative.pelvis ultrasound scan also.it was negative and no problem with utreus.and on this month after 16 th day of periods(11th 12 th jan).I saw again spotting.is there any problem.please help me.usually I had 7 days periods.is this my periods