So, your current workflow will give you the count of the eggs, but not the correct measurements as you are measuring the black&white, binarized image (I assume). You need to measure the regions you defined in the binarized image in the raw, unprocessed image.
Try checking the Add to manager box in the analyze particles dialog, then apply these regions to your raw image and then measure. You can also check Summarize… to give you a count of the regions directly from analyze particles.
Manual tresholding is not generally recommended, if you share a few samples of your data, maybe someone can suggest a better approach