Defiintely do the blood work. I have been through all of the basic fertility testing . Now, I am in the process of getting all of the blood work done to see if I am "too old." I know that is being blunt, but that is basically what my Dr. told me the first round of tests will be this month.... You might have luck with IVF.....
So you're 48 now? Well, age is definitely not on your side. Have you talked to your doctor about it? The first thing that I would want to do is get blood work done to check all your hormone levels and then go from there. Good luck!