I am 35 year old and I have been trying to get pregnant for a year. I have been regular with my menstrual cycles. This month I am late but I have had the feelings like I should start. I took a pregnancy test yesterday and it came up (-). What should I do?

It could be it's to early for this test to be accurate, leave it a few days and try again.
Be sure and do it first thing in the morning and be sure to read the intructions carefully.Sometimes the test can be done incorrectly which will give the wrong indication.

You say it's only this month that you are late,so you are very early indeed.The longer you leave it the better... goodluck