nexplanon

Hi! I just got nexplanon put in my arm yesterday and this morning when I stood up I automatically felt sick. Of course they did a pregnancy test there before putting my implant in and it was negative so is this just a side effect? I had lost my virginity the day before yesterday  o I wouldn't be possibly pregnant would I? Anyone else have these side effects using it? I'm sorry it probably sounds stupid but I'm new to this.