Does a home pregnancy test and blood tests may have been wrong ? Could I be pregnant even prove negative ? My last period was 7 /3, ovulate on 7/23 and kept sex. At the beginning of the following week I started experiencing many pregnancy symptoms including sore breasts , fatigue and headaches .

It is unlikely that both pregnancy tests were false negative. A home pregnancy test usually gives a false positive if performed soon or incorrectly, but serum pregnancy test on 9 days after the date on which menstruation is expected, it is almost always very accurate. The fact you had a period, even if abnormal, provides good evidence that she is not pregnant. (The implantation bleeding usually happens around the time when your next period is expected but is usually a very light bleeding that lasts a day or two). By the way, if you had your period on 7/3 and your next period I played the 8/1 that means that your cycles last about 28-29 days. Since ovulation usually occurs about two weeks before the next menstruation, ovulation would have been between 8/17 and 18/8. If ovulation detector used to determine this date, his "late" period caused the change of date of ovulation to 23/7. Therefore, for some reason, the previous menstrual cycle was longer than normal, which may indicate that has a functional ovarian cyst. At this point, if you still experience pregnancy symptoms, you should investigate other possible symptoms (eg ovarian cyst or thyroid disease).