Scared!

So i have been taking birth control for a month and a half. On Feb. 8th my boyfriend and I had sex. We had sex a few days after as well. We used a condom and he did not ejaculate. The only thing that worries me is that i took a couple placebo pills off my regular time, but I read that that should not do anything. February 8th, the day I had sex, I began my new pill pack for that month that morning and took it at my regular time! One week after I came down with some stomach virus or flu (i was running a fever one day with sore throat and the fever went away and i was nauseous) and puked and my stomach has not been the same since. I've had constant rumbling and nausea all day everyday. Especially after eating. (i don't eat healthy, btw) Still today I am feeling sick :( My discharge is white and has a lot of just water to it as well. I am supposed to start in the next 1-6 days. My anxiety has never been worse and I may be causing some of my sickness or anything else but I just can't stop thinking :(