HELP 👋🏼🙏🏼 someone please comment and help!

Ruby
My LAST period was February 22-26 . 
In January my period was 24-28 
According to Glow I'm not supposed to start my period until April 1st-5th . 
I've had some cramping for about 3 days , but no spotting UNTIL right now . 
I've had unprotected sex with my boyfriend March 1,5,7,8,10,11,12,15 & we've used the pull out method . But the 19th , 20th & 21st he's came inside of me , but now I'm spotting brownish ?? And it's only when I wipe ?? Does anyone know what's going on???