The recent research questioning the accuracy of rapid HIV tests has been discussed in some detail on this forum. To start, see http://www.medhelp.org/posts/show/621245. There
were other more recent discussions as well.
Even with some questions about rapid test performance, you have no worries. First, if there is roughly a 5% chance any particular rapid test is falsely negative, then the chance that 4 tests (like you had) all would be false is 0.05 x 0.05 x 0.05 x 0.05 = 0.00000625. That's less than 1 in 100,000. To that you have to add the chance you caught HIV to start with. You don't describe that event, but if it was unprotected vaginal sex with an infected woman, that itself had only a 1 in 2,000 chance of infecting you. (I am "assuming" you were unprotected -- but in fact you were protected, so your risk is lower still.) So even if your partner had HIV, your calculated risk of having it comes to no more than one in a billion. In other words, forget it.
As for time to positive HIV test, your biology of disease lecturer is talking theoretical outcomes. With modern HIV testing, for practical purposes there is no such thing as having a negative HIV test more than 3 months (maybe very rarely 6 months) after infection.
Putting all these facts together, it is simply impossible you have HIV. I hope this helps. Let's not have an ongoing follow-up discussion. There is no information you can possibly provide that would materially change my opinion or advice.
Regards-- HHH, MD