Anxious about Pregnancy?

Hey

So in late July I had protected sex with a guy, but even though he said he didnt ejaculate, I went to take a Plan B pill 2 days later.(Like 36 hours). I've been getting my periods, but lately I've just been feeling more bloated all the time and I don't know what this means. I took a test in late August (after my second period) and it was negative. Should I take another?