am I pregnant?

So around a month ago I took plan b the day after I had unprotected sex. I got my period two days early, and had it for 8 days (usually it's 5) my period was over for a good 5 days and then, I started bleeding for 3 days and it wasn't a lot it was just light enough for a liner,  and I had some tiny cramps, and I've had a headache and been dizzy for like two weeks, and for the past week, everytime I eat I always feel sick afterwards, I just don't know what's going on someone help.