which is the accurate date of period the firsTday...

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Regarding your question,

What is accurate date of menses

Regular menses comes every 28 days with variation between one female and another about 7 days. Every female know habits of her menses and irregular menses are diagnosed or noticed by her at first. If you notice irregular menses you have to seek a medical help to be examined and diagnosed by your doctor.

Vaginal bloody discharge, is it pregnancy

Based on what you mentioned, i see the following

• It may related to pregnancy, thus you can do pregnancy test to confirm or exclude pregnancy.
• Seek a medical help to do TVS to detect any problems inside your uterus
• Proper treatment is by identifying the cause and fix it.

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