Please help need some advice

Hi ladies so here's a short run down hubby n I have been ttc baby #1 since Feb (that's when I went off pill) I got my period basically straight away an had them up until august 8th have not had one since so I'm getting a little concerned considering I'm usually regular have done hpt tests all negative :( and I have not been stressed etc so my question is has thks happened to anyone? If I dont get it this month think a trip to Dr is in order as could be something more serious