Nampak Kantung

28/1 I pergi scan sebab bile test pregnancy ad double line, then after check nampak kantung je.so doc ask to come again after 3 weeks but still nampak kantung. Bile tanya last period, I said 12/12 then doc pelik sebab kantung x nampak mcm 10w.. dia ckp just mcm 5w.. so here I'm a bit confused.. Is it normal??. I ad jugak kena tompokan darah but doc says its normal.