Basically I think I was fertile from the 15th to the 21st of Jan and ovulation was on the 20th. Sorry for TMI. Me and my partner had sex on the 15th, 17th, 18th, 20th and 21st. Now its been 7 days after ovulation, and im getting lower back and lower abdomal pains and feeling sick most of the day, also have a fancy for sweets all the time, could i be at early stages of pregnacy or implantation? If so when do you think i should test?