5 days before period is due, could this be real?

Hi everyone, my period isn’t due for another 5 days. am I imagining the positive sign or is this it? Last month I thought for sure I was pregnant but then AF came on time and very heavy, lasting over 7 days. Almost thought I might have been pregnant but my body did not hold it, and that’s why my period was so heavy. If I have a positive test so early this month, could I actually have conceived last month and still had a period?