I was 6 days late and had a period that lasted one day. I only used one tampon and then the bleeding stopped. My mother in law told me that same thing happened to her when she was pregnant with my husband. Could that be the case here? My last pregnancy test came back negative and I took it the day prior to the one day I menstrated. I still get a little sick and have some back pain, but am uncertain as to what it could be related to. Is this common to be pregnant and still have a period such as this? Should I retest? Thanks for any help regarding this matter.