I have irregular periods like I skip months ,in period 05  October I take clomit from 09 to 14 to conceive twins and I dont have problem conceiving,then November ddnt see my periods,05 or 06 December I saw my period, January ddnt see my period and  last period was 02 to 04 February ,14 had sex with hubby ,and 20 with boyfriend ,21 with hubby again but drink Plan B on the 21 February and on the 23 I feel some pains... Then on the 01 March pink  spotting no period till today.and on 04 March tested Negative with urine and sonar.14 March feel cramping no period to date as well....my question is when did I conceive if im pregnant