3yrs on an implant haven't on a period for 3 years too, removed implant and took pills within the day of removal, after 4 days hubby and i got sex, is there a possibility to get pregnant?been 18 days taking pills but still haven't gotten my period?

It's less likely you can get pregnant with that scenario. Because you did not have your period for 3 years when having the implant so we may not know if you will soon have period or not and you have to finish the first pack yet. If after three months your period does not happen, you should see a GYN. Cautiously, you can do a urine pregnancy test around one week after you miss your expected period.