What is the reason for delayed menstruation and breast tenderness?

Patient's question:

My period is delayed by 6 days. It's delayed again this month, and it's already been 5 days. Every month it's delayed, sometimes nearly half a month (but I was exhausted from traveling that month). A month ago, I had an endocrine blood test, and everything was normal, no problems. Every time before my period, my breasts hurt for several days.
Past Treatment and Effects: Last month, I took three doses of traditional Chinese medicine and had diarrhea.
Help Needed: Please have an expert look at it. It's already delayed by 5 days, and my endocrine test is fine. What should I do? I'm afraid to take progesterone. My mom says it's not good to induce menstruation, and I haven't been pregnant or given birth yet. I started preparing to get pregnant last month. Will the delay affect pregnancy? I'm very urgent!

Doctor's answer:

Artificial Cycle Therapy – Targeted Treatment for Menstrual Irregularities Based on Differentiation
Traditional Chinese Medicine (TCM) holds that the production and regulation of menstruation are directly influenced by the prosperity or decline of qi and blood in the zang-fu organs and the smoothness of meridians, with a particularly close relationship with the kidneys. Artificial Cycle Therapy is based on the theory of TCM differentiation and treatment, aiming to correct disrupted menstrual cycles and establish a normal menstrual rhythm by nourishing the liver and kidneys, replenishing qi and blood, regulating the Chong and Ren meridians, and invigorating blood circulation.
Artificial Cycle Therapy classifies and treats menstrual irregularities according to a woman's unique constitution, especially for irregularities caused by endocrine disorders or other diseases, demonstrating significant efficacy. It enhances energy metabolism, allowing patients to feel a sense of warmth throughout the body and increased mental alertness. Qi-regulating and blood-activating herbs promote vasodilation, improve blood circulation, and dispel blood stasis. These herbs also warm the meridians, dispel cold, nourish blood, remove blood stasis, enhance uterine muscle blood circulation, and promote the shedding of the endometrium.