i had my dates on 18th nov.. i had sex on 29,30 nov 1,2 dec i bleed from 13dec to 17dec it was red n was in light-heavy-light pattern mine is a 25-28 day cycle... but the hpt showed negative even on 21dec...this is about last month menses cycle..now i am due wit my next dates on 6th jan i have no or probably dont feel any symptoms of preg. but i am doubtful if i was preg can a hpt show negative in the 4 week (time of expecting a period) and positive in the 6-7th week.. i did not have sex after 29 nov-1dec.. now please clarify if my bleeding was regular dates or implantation bleeding... am i preg. or not.. can i take a hpt today (3rd jan ) will it detect the hcg this late..

p.s my husband used pullout technique and we had during my ovalution time..