Unsure

Marie • College student
So I have been taking the pill religiously for about a month and a half. My first day on the pill my boyfriend decided to ejaculate inside me and I know that pill is not effective until about a week. 
​I had very light spotting and cramps a few days before my period was supposed to arrive but no period.
​I feel very nauseous and tired. 
​Could this be a side effect of the pill or should I get worried?