I have been told i need a second mammography as they see some hot spots...?

does anyone know what this means and how will the second test show anything the first one didn't...or will it be a different test?

There are many reasons to be called back after a screening mammogram. Very rarely you can be called back because the original images are of poor quality. I say very rarely because, at every facility I have ever been involved with, the mammographer will check her images before the patient is sent on their way. If an image needs to be repeated, it can be done before you leave.

Usually, additional views are needed for two reasons. The first reason could be because you have a dense area in the breast. Dense breast tissue appears white on the x-ray film. Breast tumors and breast califications (which may be an early sign of breast cancer) also appear white on the film. In order to see through that white dense breast tissue to be sure there is no pathology hidden by it, additional spot compression views may be needed. These are done, usually, in the same position as your original mammogram, but the compression paddle that is used is small and round. An image would be taken right at the area which is not seen well.

Another additional view is called spot compression, magnification views. These are done when the radiologist sees a mass or calcifications. The spot compression will make the edges of the mass or calcifications better and the magnification will make the area larger. A cyst (which are benign...not cancer) can be the cause of the mass seen on the image, and many calcifications are not malignant. These views will show the area better, so the radiologist can determine if you need to be watched every 6 months or even if you need a biopsy.

An ultrasound can be helpful in some situations, but many "lumps" and NO calcifications will be seen on u/s. Many times, in the facility where I work, we will call a patient back for additional mammo views and/or an ultrasound. Remember that the far majority of these patients (I would guesstimate upwards of 90%) will eventually get a totally benign diagnosis, even if it is taken to the level of biopsy. It is kind of a case of better safe than sorry. I would rather have one too many exams than one too little and have something get missed......

they are now giving MRI to see more {I wish you good luck}

Ask them if they can do an ultrasound to look at the areas in question. They will need the original films to guide them through the ultrasound.
If they do not want to do an ultrasound ask them why they want to do another mammogram. If they insist on another mammogram tell them you want a different tech to perform the test.
Good Luck