Okay so, I had sex the 7th of August and the condom broke so I took plan b for the first time,

I got my period the 15-18 like normal after my period stopped I had sex again the 22nd and the condom broke again and I took plan b again, I was spotting the 27th but it was weird to me because I gotten my period two weeks before but it was plan b side effects, it’s the 22 of September and i was supposed to get my period the 16th of September but still no sign of my period? I took a pregnancy test already but it came out negative and i took another one today and still negative after the whole week, is it just plan b messing up my system and pushing my period back?