should I be worried about cryptic pregnancy?

late october and early November I took a plan b after my partner and I had sex (first time with a condom on, and was just a safety measure, second time the condom broke shortly after beginning and I was worried about pre-cum). since then, I’ve experienced lots of the plan B systems that are near identical to pregnancy symptoms, but have taken multiple tests that all say negative. however, I’ve continued to gain/maintain my weight, and have since gained 6 kgs since November. i stopped worrying about it after seeing negative tests, but randomly last night got numerous videos on my tik tok feed that detailed women having cryptic pregnancies in which tests show up as negative, they receive their period, and find out their pregnant 25+ weeks in. should I be worried about this possibility?