No period?

Ok so this is the 2nd month I've went without a period any ideas on what might could be the reason? I took 2 pregnancy tests last month and they both came back negative. Note: I have 2 kids already and both were not that easy to conceive I just wasn't getting pregnant. I have precancerous cells, hpv (a strand the shot didn't cover), herpes (likes the cold sore type), I'm susceptible to infections apparently, and with both pregnancy ' s I hemorrhaged. Everytime I got to the obgyn there's always something else wrong and just want to see what could possibly be wrong before I go to kinda prepare myself. Lol I know it sounds stupid but it helps. Thanks in advance for any help. God bless