Birth control pill

Cayla • I have had 4 miscarriage already. I have PCS. I was a premature baby. I was 1 pound and 3 ounces and 24 weeks early and 12 inches and I had tubes in me so my right vocal cord is paralyzed so I talk in a soft whisper. Ryan Rasner 5/5/23-5/6/23. Zyla 4/03/2

So I started the birth control pills again yesturday after my chemical pregnacy which is a miscarriage a couple weeks ago, when I had my second day of my period and it stopped today. Am I still protected or do I have to use back up method?