Plan b fail?

I'm not sure if I've conceived....

Had sex on 8/6 - pull out method was used but we think there was a little that got inside. I took plan b on 8/10, as I've read and heard many times it can still be effective at the 4 day mark.

Had sex again on 8/12 - no pull out or contraception at all, so had to take plan b again on soonest date able to get it which was 8/16 (again, on the fourth day.).

I haven't gotten my period as of 8/24, but don't have the usual symptoms of pregnancy, just some weird hormonal stuff going on.

I know every pregnancy is different, so not sure if I'm pregnant or just experiencing hormonal backlash from plan b.

Thoughts? Experiences?