No period since Jan 9th & neg test

I was in here a couple of weeks ago and was asking about pregnancy. I have not had a period since Jan 9th and have taken several at home tests all negative. Matter of fact I took one today and it was negative. I beleive it may be time to see a doctor. I was on the pill for 16 years and just got off them last June with perfect on time periods until now could this be my problem?? If I am not pregnant that means I am not ovulating and that worries me since I am now 34 years old.