Bleeding like period but pregnant

Has anyone had what was like your period but still end up being pregnant. I hear stories of women getting there period and find out they are pregnant. Who has had there "period" and got a positive pregnancy test? I had my period but it seemed lighter but still my normal but started feeling constipated and nauseaous after my period was over and now this week I should be ovulating but I haven't gotten a peak ovulation test yet.