I still feel morning sickness everyday even while on my period

I am on birth control pills but with my hectic work schedule I've missed a pill or so & taken several of them late . Me & my boyfriend had unprotected sex at the end of February & on march 3rd . Recently I started getting pregnancy symptoms & march 14I woke up feeling super queasy & light headed I ate a bowl of cereal around 10 am & that was it & around 4 pm while at work I started vomiting & I came home I felt like I had to vomit , my roommate was smoking & the smell immediately made me vomit more , I Layed down for a few hours I was super hot & uncomfortable & then I woke up to try to eat something as soon i smelled the food I immediately became nauseated again , I have also had white discharge , I've been sleeping alot , back pains . The only thing is my period came as scheduled on march 16 I took a test the day before they were negative I'm just really confused as to why I'm having pregnancy symptoms , could I still be pregnant ? I still feel morning sickness everyday even while on my period .