I Took Regesterone To Induce My Period (2 Tablets Each

I took regesterone to induce my period (2 tablets each day, morning and night for 3 days as adviced by my doctor). I have been doing this for 5-6 month. I got my period on the 3rd. I had unprotected sex on the 9th (pull out) and took an ipill on the 11th because I panicked. Is this safe? I am worried about the side effects.