This might be a dumb question but bare with me

So yeah this may be super dumb but I was just wondering if anyone else has had this problem or period was 5 days late this time and I didn't necessarily think I was pregnant because I only had pms symptoms but for a split second there was a scare. When I got my period my friend asked if it was a regular flow or if I was spotting and it has been a little lighter. She told me it's possible I could be pregnant even though I got my period just because it's lighter, is that true? I thought if you got your period you automatically not pregnant πŸ™ŠπŸ™„