Plan b pill...kind of worried (opinions please)?

So I've taken plan b twice with in two weeks. Me and my fiance had intercourse two weeks before the 2nd pill and the condom broke. Same the 2nd time. The first time I took plan be I had taken it the day my cycle was to start. In the process I had nausea and my period came 3 or 4 days after taken plan b. It started off as spotting.... so two weeks pass and we had another slip up 26hours later I took the pill. Its been a whole week and no spotting or anything, the end of the week it will be two weeks. I also started birth control 2days after taken plan b. I've been nauseate every single day on and off. Some smells make it worst. My mom keeps saying somethings different about me and ask if I'm pregnant and a few other people outside of home has mentioned it. Anyone have this experience.