possible pregnancy

Sooo, the last month has had lots of ups and downs for me... hell the last 6 months have been hell! But I made some mistakes and slept with a few people this month. According to my eve app, I should have started today. My periods have been fairly regular for awhile now due to taking care of myself and not taking hormonal birth control... I just started a relationship with one of the guys I slept with... and I'm terrified I'm not just late and how do you explain that to a new boyfriend. Ease my mind ladies... I need it!