The Pullout Method

So every time I've had sex, we just use the Pullout method. I've never been on birth control & I've already used plan b twice within a year. I know you're not suppose to take it more than 3x in a year because it can ruin something. So I've been so paranoid that I could be pregnant because my body just feels weird and has been changing, yet I still get periods. I feel it could be one of those "I didn't know I was pregnant" situations. I wanna go check with a professional so I can know for sure. Where do I go to get checked up?