What Are The Side Effects Of Emergency Contraceptive Pills?

Hi Doctor.

I am 29. married. My periods have always been 40-50 days cycle. ever since the beginning.
After marriage i took daily oral contraceptive for 6 months in which period the cycle got to 28-30 days.

People said they are harmful , so i stopped the piils. its has been over a year/15 months since i stopped , and now my periods are back to the 50 day cycle.
We had unprotected sex on 1st and 5th of February and i took i-pill a day later on both occassions. but i have not had my period yet.

Could i be pregnant ? Can a home pregnancy test detect a pregnancy this soon ?

If not, will a doctor be able to diagnose if i am pregnant for last 10-15 days ?
If i am pregnant can i take a mifeprin trip for chemical abortion ?

Please advise.