Based on my duw date of 2/28/2015 the likely date of conception was 6/7/2014 so was i already 2 weeks pregnant when june 7th came?

No: That was the day your egg was impregnated with semen

Dates: the weeks of pregnancy are actually figured from the last period not the date of conception so it is usually 2 weeks longer than the actual age

From LMP: Dates are calculated from your last menstrual period, so the date of conception is paradoxically at the 2 weeks gestation mark. This confusion is a left over problem from when we had nothing but menstrual cycle to date pregnancies.