Hello
Welcome to ehealthforum and thanks for writing
As you went off the pills recently it is difficult to comment regarding pregnancy.Woman usually take few months to a year to conceive and it varies in every individual depending on the menstrual cycle and ovulation.
If after coming off the pills you are having normal ovulation then chances of pregnancy are possible.Other than that irregular cycles and nausea might be due to hormonal levels being normalized.
Wait for a week and if the periods do not start then get a Urine test done for pregnancy determination.Consider visiting a Gynaecologist for evaluation.Have regular intercourse and avoid stress.Restrict smoking and alcohol.
Take care!