Most women ovulate around day 14. Some earlier or later by a few days based on a 28 day cycle. If your cycle started on the 3rd, I would expect you to ovulate around the 17th (day 14 of your cycle). It is unlikely that you could be pregnant, but not impossible. If you miss your cycle, you should take a test.
Chances are very very low!!!! most woman have 28 day clcles. cycle day(cd) 1 being the first day of your peroid. if u have a 28 day cycle then u o on the 14th cd. maybe 24 hours before or after....
It is possible to ovulate on cd 7 but most women dont.