In the current scenario, you need to have a trans-vaginal sonogram along with an estimation of the serum beta-hCG
titres to definitely confirm/exclude pregnancy
. Since you have the history of getting induced periods regularly, it is unlikely that you may have conceived since ovulation cannot be established with such an irregular menstrual pattern. Susten
can be safely used and you may see a withdrawal bleed 3-7 days after completion of the treatment if you are not pregnant. Hope this helps.