So, every single month since January, my period always started on the 1st of the month. Last month, it started on the 4th, and I went to my ob, whom did a vag ultrasound and told me that I was ovulating on the 17th. I have taken a pregnancy test, but I haven't gotten a positive yet. My periods are never late, when would be the right time to take a test? I must add that I did have sex on those days, and yes, this is month two of trying for a baby. Any suggestions on taking a test as well? Thanks in advance.