What are the early pregnancy symptoms?

Patient's question:

Medical Description: 40 days ultrasound showed 1 cm, 48 days showed 1.4 cm, both without heartbeat. I believed it was due to poor nutrition and bad mood, so I paid more attention later. There was bleeding during this period, but it stopped after improving nutrition and mood. Now the early pregnancy symptoms are becoming more obvious. Since it's still less than 60 days, I haven't had another ultrasound. Could these early pregnancy symptoms indicate normal embryo development? Is it normal to have primitive cardiac tube at 58 days of pregnancy?
Past Treatment and Effects: No treatment for maintaining the pregnancy.
What Help Do You Want: Thank you for your help.

Doctor's answer:

1. Menstruation stops
For women of normal fertile age, if their menstruation is regular, experiencing more than two weeks beyond the normal menstrual period after sexual activity may indicate pregnancy.
2. Breast tenderness, swelling, and itching
This is a physiological symptom of early pregnancy. Changes may include darker areola color, prominent subcutaneous veins in the breasts, and visibly protruding nipples.
3. Nausea and vomiting
Many women in early pregnancy often experience nausea and vomiting, especially in the morning. These symptoms vary from person to person—some have mild symptoms, while others have severe ones.
4. Changes in skin color
Skin hyperpigmentation or the appearance of stretch marks on the abdomen may occur, particularly more noticeably in the later stages of pregnancy.
5. Vaginal mucosa discoloration
In early pregnancy, the vaginal mucosa may appear darker due to congestion.
6. Fatigue
Fatigue is common in early pregnancy, often accompanied by a strong desire to sleep.
7. Frequent urination
During the third month of pregnancy, as the bladder is increasingly compressed by the growing uterus, its capacity decreases, leading to frequent urination.