Missed period and very confused

Hello All
Just wondering if any of you ladies can offer me some advice. My cycle is always between 23-25 days and my period only lasts 2-3 days max. I am now on day 30 of my cycle and still no period. I have taken 2 tests and both are negative. I am really confused and upset as I have never missed a period and I am never this late. To make matters worse my partner lives abroad and this situation has now made it really difficult for me to track my ovulation and make sure we are in the same country when I am ovulating. We have been trying for 8 months now and I am starting to think it won't ever happen for us and I have left it too late. I am 38. Any advice would be greatly appreciated. As I am not sure if I should visit my doctor as this has made me think something is wrong. Thanks