How is this possible?

Kelsey

Hi guys! My husband and I have been arguing a lot these past couple of days and he told me I was being over emotional and moody. To take a pregnancy test. I thought for sure it was going to be negative because my period is due in 5 days.. that puts me at like 10dpo. How in the world did I get three strong positives? The two together are from last night without fmu

This is this morning with fmu

My last period was only four days but it's normally 5-7 and it was super light. Is it possible I concieved last month?