Hallow Dear, At the time of ovulation, little spotting for few hours is known. It is called as Mittelschmerz. This is very little spotting for few hours. So after the spotting is over, there is no harm in having intercourse. Bleeding on day 6 of the cycle cannot be Mittelschmerz. It is just an extended menstrual bleeding. During menstrual bleeding, intercourse carries risk of infection since blood is a very good medium for the growth of pathogens. On this day intercourse is futile also since there is no egg present on this day. The fertile period is not around day 6 of the cycle. The egg is released 14 days prior to the next expected menses. The egg has life of 24 hours and the sperms are active for 72 hours. Hence a period of about a week around the day of egg release (ovulation) is considered as fertile period. Those who are keen to have pregnancy should concentrate on this period for sexual relations. You are following further with bbt also to identify the day of ovulation. Now you have more accurate methods available for locating the day of ovulation. Ovulation kits available in the market are good for practical purpose. Ultrasonography ovulation monitoring is a very good method. From day 9 of the cycle, daily ultrasonography informs about the development of follicle & endometrium and the event of egg release also. Follicles which ovulate when they are between 18 mm to 21 mm size have best results of conception and continuation of pregnancy. For successful implantation of fertilized ovum, endometrium of 10 mm or more thickness is lucrative. Considering the life of egg and sperms, you can definitely avoid the intercourse during Mittelschmerz since it is a short phase of the day; and still have successful intercourse during or around the ovulation. I hope this helps you. Dr. Nishikant