26 days late

my last period ends 8.30 I had sex 9.1 took a plan b afterwards. I had sex again 9.15 with no condom. I didn't have period at all in Sep (that I can remember and ita not in my log). I've taken several test last being on Friday and negative. I've been late before once a year the most being 35 days late. What do you guys think?

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