Should I see a doctor?

So May 8th and 14th I took a Plan B for obvious reasons. Then the rest of May and this month we’ve been having unprotected sex because we’re now TTC. My period is 20 days late and I’ve taken pregnancy test like crazy and they all come back negative so I don’t know if I’m pregnant or it’s the Plan B that completely messed up my cycle or if something else is wrong. What do you ladies think I should do because I’m honestly starting to freak out thinking there’s something else going on.