Pregnant or not

Idk if I’m pregnant or not. I’ve been feeling extremely nauseous for the past couple weeks whenever I lay down going to bed. I had sex one week and took plan b afterwards, then I had sex again the next week and took another plan b. I got my period, so that’s why I’m doubting if I’m pregnant or not. But idk if I was suppose to get two periods, since I took two plan b’s. I only got one. I got my period after taking the second plan b also. This was at least two weeks ago.