Am I Being Paranoid or Reasonable???

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 OKAY so. My period is like 39 days late at this point. My periods have been regular for almost two years. My boyfriend (ex boyfriend now, we just broke up not long ago) and I have had unprotected sex but he never finished in me from what I can remember. There is a possibility that he finished on like the outside though maybe?? And I know you can also get pregnant from precum. 
I took two test like a two weeks ago and from what I could tell, they were negative but I'm still having a lot of pregnancy symptoms– nausea/vomiting, sore boobs, I pee allll the freaking time, etc and most obviously my period is super late. 
So should I take another test or would the two negative tests be accurate. Is it possible that I could be pregnant but just not very far along? The last time we had sex was like early January.