Pregnant??

Marrisa • Hi I'm Marrisa. 20 y/o. Always open to making new friends. ☺️ I'm bisexual and in a polyamorous relationship.
I'm four days late on my period. My boyfriend and I don't use any kind of contraception besides the pull out method. I woke up and was fine this morning but he pulled me back to bed this morning for cuddles and nausea hit me like a train. 
    I don't know much about morning sickness or how it works if it's sudden or just creeps up on you. Do I need to be concerned?