Hi, I am not a certified psychic, but my heart goes out to you in your grief and struggle. I had 2 miscarriages, and shortly thereafter my husband abandoned our marriage. I was so hurt that I didn't think about having other children. As time went on and I recovered, I engaged in meditation and came to understand that there were several personal reasons why I should not be a conventional mother in this lifetime. Later, I had an experience where my children (turns out there were 4) communicated to me that they were watching over me. Even later, I realized that they were moving on to their next incarnations. It was a good experience, to understand that no effort is lost in this lifetime, and that life truly is eternal, existing in either a manifest or latent state.
My sense is that you have been pushing yourself very hard. Your comment, "...I had a healthy baby boy, but by C-section", has the sound that you are judging yourself, holding your experience up to what is perhaps an unattainable standard. You are very, very fortunate to have a healthy child. It is very important that you are able to feel gratitude and appreciation for the fortune that you do have in your life. It is not necessary to meet any standard or goal about the number of children you have. You must be strong and healthy to have been able to endure 4 pregnancies. But, child bearing is difficult and can be dangerous. You must take care of your physical and spiritual health. It is also important that you let your son know his value. You do not want him to grow up believing that you wanted more children because he is inadequate, that he was not able to fulfill your needs.
Please just rest for now. Allow your body to recover. Get good nutrition and lots of rest. If you have a religion, study to deepen your faith. If you do not, seek out some practice or meditation that makes you feel spiritually complete. Your life is a treasure, just as it is. I wish you future happiness and fulfillment.