Welcome to health care magic!
I have gone through your question and from that I found that your concern is that you want to avoid pregnancy
. You have planned to go for condoms and withdrawal method to keep you from getting preganant.
From my clinical experience I can say that condom is a good option to prevent pregnancy as well as protect your self from other sexually transmitted diseases.
The other method which you want to use is withdrawal method, which is not very effective and safe. It is not only difficult to perform, but it's success chances are not very good. It can be done but when one has to practice it several times before you become accustomed.
However, You are planning to go with the combination of condom and withdrawal technique which looks fine .The days you have chosen have lesser possibility of getting preganant, provided you have a normal and regular me natural cycle ( about which you have not mentioned anything). However, no method is 100% safe, all methods have some failure rate.
These measures are fine for doing sex sometimes, but of you shift to go for regular sexual relationship, I would advice you to consult a gynaecologist for better and safer options.
Hope this answer helps you.
Feel free to ask more questions regarding your health.
Dr. Manisha Gopal