Am I pregnant or just sick ?

Why after I eat do I feel like throwing up ???? I took two tests this month and both negative I got my period last month my period is due to come at the end of the month should I be worried am I pregnant ??? I been using condoms every time me and my BF have sex so we are using protection we already have a 6 month old baby together should I be worried ?? Can any moms give me advices plz I'm worried