Will There Be No Second?

The first time I got pregnant I didn't understand anything, I wasn't sick, nothing ... Good thing it was the good old cycle. I wonder about that now. 2 days ago I was so sick that I barely got out of bed, I vomited twice at night and I was like that all day. Since I am not familiar with this type of pregnancy, I wonder if it is possible to be wrong The next day I was like new ....