Help coming off the pill.....should i get a blood preg. test?

i came off the pill(orto tri cyclen) about 2 mths. ago. the first month after i had my period like normal on time. the 2nd mth. 2wks have now gone by past normal and still no period. i have taken 3 preg. tests at diff. times 3 days late, 1 wk, 1 and half wks late but all neg. is this normal? when will i get my period? can i trust the preg. test or get a blood test? im lost