Well, let's see. DC 26 is pretty late for ovulation, but it does sound like you have two mature follicles there, so yes, definitely BD for a few days.
Here's my interpretation of your RE's plan.
1. If in two weeks you're pregnant, GREAT! No need for further tests :-)
2. If you get your period. Time to check your FSH levels on DC2 (usually done CD2-3). This twill give him and you a better idea of your fertility (number and quality of eggs left in your ovaries). He might also check your estrogen (estradiol) to make sure it's in the normal range. Then create a plan of action, based on the results.
3. If you don't get your period, you probably didn't ovulate, and if so, he will probably give you progesterone to start a new cycle, and then either increase your clomid dose or have you try a different fertility drug. He might also want to do a scan to make sure the follicles didn't turn into cysts. If they did, you might have to take a month off from any meds to wait for them to resolve (which they usually do on their own, and you can probably still TTC on your own that month).
As for your weight, being too underweight or overweight can affect ovulation, so I'm sure that's why he mentioned possibly gaining some weight if you don't get a period.
Best of luck with everything!
Thanks for your response. I started to feel some cramping last night, so perhaps that is ovulation-related?Yes, the bloodwork scheduled (if I get AF) on CD2-3 is for estrodiol, cancer, FSH levels and some other hormone that starts with an A that he wrote in on the form. He will also do a HyCoSy at that time. He did say that if the Clomid didnt work (no idea why it would take this long) that he has another drug that will def make me O. My BMI is 19, so I know it's on the low side--I have been working on eating more and exercising a bit less in order to gain a few! I guess now I just have to wait and see...nerve-wracking!!