Hallow Dear, The first cardinal symptom of pregnancy is missing a period. After 12 May you did not get any menses. So have almost 10 weeks period of amenorrhoea. By this time you should have got the other symptoms like: a. Nausea, vomiting with pica b. Frequency of urination c. Breast changes like engorgement and tenderness, darkening of the areola & nipples with Montgomery s tubercles under the areola & widening of areola and secretions from the nipple. These all symptoms suggest the possibility of the pregnancy. However, to confirm pregnancy, you have to get clinically examined from a Gynaecologist who by this time can definitely detect the pregnancy. Pregnancy test on early morning first urine sample also will detect the pregnancy at this stage. So I would request you to get your urine tested for pregnancy and then report a Gynaecologist. Fast stomach beats and in the part of the neck are not symptoms of pregnancy. You are getting these symptoms after walking for a while. Please report to your physician for cardio-respiratory check up. I hope this helps you at this stage. Dr. Nishikant Shrotri