Opinions!

Brooke • I am a mother of a 3 y/o boy! Just moved to Tampa, FL. And happily in love.
Today is cycle day 37. I am not on BC, & my bf  and I have intercourse a lot. I missed my period (as of the calendar on this app) I took a pregnancy test, but it said not pregnant. I have no symptoms of pregnancy or anything (I have a 3 y/o) I am not cramping or anything either. Opinions? Has this happened to anyone else? 
​Thanks!